fix ctx.h #38

nmtigor · 2013-06-19T22:20:21Z

No description provided.

nmtigor · 2013-06-20T08:09:13Z

drivers/gpu/drm/nouveau/core/engine/graph/ctx.h

@@ -123,7 +123,7 @@ struct nouveau_grctx {
 	reg = (reg - 0x00400000) / 4;
 	reg = (reg - ctx->ctxprog_reg) + ctx->ctxvals_base;

-	nv_wo32(ctx->data, reg * 4, val);


See definition of nouveau_grctx above, ctx->data is simply a pointer of ctxprog array.

There was sync mutex which was held over userspace. That is very wrong and could cause deadlock if different userspace process is used to "unlock". Wait queue seems to be correct solution for that kind of synchronizing issue so use it instead. lock debug gives following bug report: ================================================ [ BUG: lock held when returning to user space! ] 3.9.0-rc1+ torvalds#38 Tainted: G O ------------------------------------------------ tzap/4614 is leaving the kernel with locks still held! 1 lock held by tzap/4614: Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Kernel crash log: Unable to handle kernel NULL pointer dereference at virtual address 00000001 pgd = d02ec000 [00000001] *pgd=00000000 Internal error: Oops: 1 [#1] PREEMPT SMP Modules linked in: CPU: 0 Not tainted (3.0.35-05332-ga7a1dec-dirty torvalds#38) PC is at i2c_imx_probe+0xdc/0x434 LR is at i2c_imx_xfer+0x53c/0x75c pc : [<c002645c>] lr : [<c03b1e98>] psr: 20000013 sp : d41c3dd8 ip : 00000001 fp : 00000001 r10: 00000001 r9 : ffff8fcc r8 : d41c3e48 r7 : c08f4dc0 r6 : 00000001 r5 : d41c3e48 r4 : d447f000 r3 : d417cbe0 r2 : 00000001 r1 : 000186a0 r0 : d447f000 Flags:nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel ... Process kworker/0:3 (pid: 1254, stack limit = 0xd41c22f0) Stack: (0xd41c3dd8 to 0xd41c4000) 3dc0: 00000000 I2C driver call the function "static void __init i2c_imx_set_clk()" in runtime, the function is linked to init.text section, and don't be used after kernel bootup. Remove the "__init" statement to fix the issue. Signed-off-by: Fugang Duan <B38611@freescale.com>

As the new x86 CPU bootup printout format code maintainer, I am taking immediate action to improve and clean (and thus indulge my OCD) the reporting of the cores when coming up online. Fix padding to a right-hand alignment, cleanup code and bind reporting width to the max number of supported CPUs on the system, like this: [ 0.074509] smpboot: Booting Node 0, Processors: #1 #2 #3 #4 #5 torvalds#6 torvalds#7 OK [ 0.644008] smpboot: Booting Node 1, Processors: torvalds#8 torvalds#9 torvalds#10 torvalds#11 torvalds#12 torvalds#13 torvalds#14 torvalds#15 OK [ 1.245006] smpboot: Booting Node 2, Processors: torvalds#16 torvalds#17 torvalds#18 torvalds#19 torvalds#20 torvalds#21 torvalds#22 torvalds#23 OK [ 1.864005] smpboot: Booting Node 3, Processors: torvalds#24 torvalds#25 torvalds#26 torvalds#27 torvalds#28 torvalds#29 torvalds#30 torvalds#31 OK [ 2.489005] smpboot: Booting Node 4, Processors: torvalds#32 torvalds#33 torvalds#34 torvalds#35 torvalds#36 torvalds#37 torvalds#38 torvalds#39 OK [ 3.093005] smpboot: Booting Node 5, Processors: torvalds#40 torvalds#41 torvalds#42 torvalds#43 torvalds#44 torvalds#45 torvalds#46 torvalds#47 OK [ 3.698005] smpboot: Booting Node 6, Processors: torvalds#48 torvalds#49 torvalds#50 torvalds#51 #52 #53 torvalds#54 torvalds#55 OK [ 4.304005] smpboot: Booting Node 7, Processors: torvalds#56 torvalds#57 #58 torvalds#59 torvalds#60 torvalds#61 torvalds#62 torvalds#63 OK [ 4.961413] Brought up 64 CPUs and this: [ 0.072367] smpboot: Booting Node 0, Processors: #1 #2 #3 #4 #5 torvalds#6 torvalds#7 OK [ 0.686329] Brought up 8 CPUs Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Libin <huawei.libin@huawei.com> Cc: wangyijing@huawei.com Cc: fenghua.yu@intel.com Cc: guohanjun@huawei.com Cc: paul.gortmaker@windriver.com Link: http://lkml.kernel.org/r/20130927143554.GF4422@pd.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>

Turn it into (for example): [ 0.073380] x86: Booting SMP configuration: [ 0.074005] .... node #0, CPUs: #1 #2 #3 #4 #5 torvalds#6 torvalds#7 [ 0.603005] .... node #1, CPUs: torvalds#8 torvalds#9 torvalds#10 torvalds#11 torvalds#12 torvalds#13 torvalds#14 torvalds#15 [ 1.200005] .... node #2, CPUs: torvalds#16 torvalds#17 torvalds#18 torvalds#19 torvalds#20 torvalds#21 torvalds#22 torvalds#23 [ 1.796005] .... node #3, CPUs: torvalds#24 torvalds#25 torvalds#26 torvalds#27 torvalds#28 torvalds#29 torvalds#30 torvalds#31 [ 2.393005] .... node #4, CPUs: torvalds#32 torvalds#33 torvalds#34 torvalds#35 torvalds#36 torvalds#37 torvalds#38 torvalds#39 [ 2.996005] .... node #5, CPUs: torvalds#40 torvalds#41 torvalds#42 torvalds#43 torvalds#44 torvalds#45 torvalds#46 torvalds#47 [ 3.600005] .... node torvalds#6, CPUs: torvalds#48 torvalds#49 torvalds#50 torvalds#51 #52 #53 torvalds#54 torvalds#55 [ 4.202005] .... node torvalds#7, CPUs: torvalds#56 torvalds#57 #58 torvalds#59 torvalds#60 torvalds#61 torvalds#62 torvalds#63 [ 4.811005] .... node torvalds#8, CPUs: torvalds#64 torvalds#65 torvalds#66 torvalds#67 torvalds#68 torvalds#69 #70 torvalds#71 [ 5.421006] .... node torvalds#9, CPUs: torvalds#72 torvalds#73 torvalds#74 torvalds#75 torvalds#76 torvalds#77 torvalds#78 torvalds#79 [ 6.032005] .... node torvalds#10, CPUs: torvalds#80 torvalds#81 torvalds#82 torvalds#83 torvalds#84 torvalds#85 torvalds#86 torvalds#87 [ 6.648006] .... node torvalds#11, CPUs: torvalds#88 torvalds#89 torvalds#90 torvalds#91 torvalds#92 torvalds#93 torvalds#94 torvalds#95 [ 7.262005] .... node torvalds#12, CPUs: torvalds#96 torvalds#97 torvalds#98 torvalds#99 torvalds#100 torvalds#101 torvalds#102 torvalds#103 [ 7.865005] .... node torvalds#13, CPUs: torvalds#104 torvalds#105 torvalds#106 torvalds#107 torvalds#108 torvalds#109 torvalds#110 torvalds#111 [ 8.466005] .... node torvalds#14, CPUs: torvalds#112 torvalds#113 torvalds#114 torvalds#115 torvalds#116 torvalds#117 torvalds#118 torvalds#119 [ 9.073006] .... node torvalds#15, CPUs: torvalds#120 torvalds#121 torvalds#122 torvalds#123 torvalds#124 torvalds#125 torvalds#126 torvalds#127 [ 9.679901] x86: Booted up 16 nodes, 128 CPUs and drop useless elements. Change num_digits() to hpa's division-avoiding, cell-phone-typed version which he went at great lengths and pains to submit on a Saturday evening. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: huawei.libin@huawei.com Cc: wangyijing@huawei.com Cc: fenghua.yu@intel.com Cc: guohanjun@huawei.com Cc: paul.gortmaker@windriver.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20130930095624.GB16383@pd.tnic Signed-off-by: Ingo Molnar <mingo@kernel.org>

Kernel crash log: Unable to handle kernel NULL pointer dereference at virtual address 00000001 pgd = d02ec000 [00000001] *pgd=00000000 Internal error: Oops: 1 [#1] PREEMPT SMP Modules linked in: CPU: 0 Not tainted (3.0.35-05332-ga7a1dec-dirty torvalds#38) PC is at i2c_imx_probe+0xdc/0x434 LR is at i2c_imx_xfer+0x53c/0x75c pc : [<c002645c>] lr : [<c03b1e98>] psr: 20000013 sp : d41c3dd8 ip : 00000001 fp : 00000001 r10: 00000001 r9 : ffff8fcc r8 : d41c3e48 r7 : c08f4dc0 r6 : 00000001 r5 : d41c3e48 r4 : d447f000 r3 : d417cbe0 r2 : 00000001 r1 : 000186a0 r0 : d447f000 Flags:nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel ... Process kworker/0:3 (pid: 1254, stack limit = 0xd41c22f0) Stack: (0xd41c3dd8 to 0xd41c4000) 3dc0: 00000000 I2C driver call the function "static void __init i2c_imx_set_clk()" in runtime, the function is linked to init.text section, and don't be used after kernel bootup. Remove the "__init" statement to fix the issue. Signed-off-by: Fugang Duan <B38611@freescale.com>

…hing Dave Jones reported that trinity would be able to trigger the following back trace: =============================== [ INFO: suspicious RCU usage. ] 3.10.0-rc2+ torvalds#38 Not tainted ------------------------------- include/linux/rcupdate.h:771 rcu_read_lock() used illegally while idle! other info that might help us debug this: RCU used illegally from idle CPU! rcu_scheduler_active = 1, debug_locks = 0 RCU used illegally from extended quiescent state! 1 lock held by trinity-child1/18786: #0: (rcu_read_lock){.+.+..}, at: [<ffffffff8113dd48>] __perf_event_overflow+0x108/0x310 stack backtrace: CPU: 3 PID: 18786 Comm: trinity-child1 Not tainted 3.10.0-rc2+ torvalds#38 0000000000000000 ffff88020767bac8 ffffffff816e2f6b ffff88020767baf8 ffffffff810b5897 ffff88021de92520 0000000000000000 ffff88020767bbf8 0000000000000000 ffff88020767bb78 ffffffff8113ded4 ffffffff8113dd48 Call Trace: [<ffffffff816e2f6b>] dump_stack+0x19/0x1b [<ffffffff810b5897>] lockdep_rcu_suspicious+0xe7/0x120 [<ffffffff8113ded4>] __perf_event_overflow+0x294/0x310 [<ffffffff8113dd48>] ? __perf_event_overflow+0x108/0x310 [<ffffffff81309289>] ? __const_udelay+0x29/0x30 [<ffffffff81076054>] ? __rcu_read_unlock+0x54/0xa0 [<ffffffff816f4000>] ? ftrace_call+0x5/0x2f [<ffffffff8113dfa1>] perf_swevent_overflow+0x51/0xe0 [<ffffffff8113e08f>] perf_swevent_event+0x5f/0x90 [<ffffffff8113e1c9>] perf_tp_event+0x109/0x4f0 [<ffffffff8113e36f>] ? perf_tp_event+0x2af/0x4f0 [<ffffffff81074630>] ? __rcu_read_lock+0x20/0x20 [<ffffffff8112d79f>] perf_ftrace_function_call+0xbf/0xd0 [<ffffffff8110e1e1>] ? ftrace_ops_control_func+0x181/0x210 [<ffffffff81074630>] ? __rcu_read_lock+0x20/0x20 [<ffffffff81100cae>] ? rcu_eqs_enter_common+0x5e/0x470 [<ffffffff8110e1e1>] ftrace_ops_control_func+0x181/0x210 [<ffffffff816f4000>] ftrace_call+0x5/0x2f [<ffffffff8110e229>] ? ftrace_ops_control_func+0x1c9/0x210 [<ffffffff816f4000>] ? ftrace_call+0x5/0x2f [<ffffffff81074635>] ? debug_lockdep_rcu_enabled+0x5/0x40 [<ffffffff81074635>] ? debug_lockdep_rcu_enabled+0x5/0x40 [<ffffffff81100cae>] ? rcu_eqs_enter_common+0x5e/0x470 [<ffffffff8110112a>] rcu_eqs_enter+0x6a/0xb0 [<ffffffff81103673>] rcu_user_enter+0x13/0x20 [<ffffffff8114541a>] user_enter+0x6a/0xd0 [<ffffffff8100f6d8>] syscall_trace_leave+0x78/0x140 [<ffffffff816f46af>] int_check_syscall_exit_work+0x34/0x3d ------------[ cut here ]------------ Perf uses rcu_read_lock() but as the function tracer can trace functions even when RCU is not currently active, this makes the rcu_read_lock() used by perf ineffective. As perf is currently the only user of the ftrace_ops_control_func() and perf is also the only function callback that actively uses rcu_read_lock(), the quick fix is to prevent the ftrace_ops_control_func() from calling its callbacks if RCU is not active. With Paul's new "rcu_is_watching()" we can tell if RCU is active or not. Reported-by: Dave Jones <davej@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Command "tcrypt sec=1 mode=403" give the follwoing error for Polling mode: root@am335x-evm:/# insmod tcrypt.ko sec=1 mode=403 [...] [ 346.982754] test 15 ( 4096 byte blocks, 1024 bytes per update, 4 updates): 4352 opers/sec, 17825792 bytes/sec [ 347.992661] test 16 ( 4096 byte blocks, 4096 bytes per update, 1 updates): 7095 opers/sec, 29061120 bytes/sec [ 349.002667] test 17 ( 8192 byte blocks, 16 bytes per update, 512 updates): [ 349.010882] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 349.020037] pgd = ddeac000 [ 349.022884] [00000000] *pgd=9dcb4831, *pte=00000000, *ppte=00000000 [ 349.029816] Internal error: Oops: 17 [#1] PREEMPT SMP ARM [ 349.035482] Modules linked in: tcrypt(+) [ 349.039617] CPU: 0 PID: 1473 Comm: insmod Not tainted 3.12.4-01566-g6279006-dirty torvalds#38 [ 349.047832] task: dda91540 ti: ddcd2000 task.ti: ddcd2000 [ 349.053517] PC is at omap_sham_xmit_dma+0x6c/0x238 [ 349.058544] LR is at omap_sham_xmit_dma+0x38/0x238 [ 349.063570] pc : [<c04eb7cc>] lr : [<c04eb798>] psr: 20000013 [ 349.063570] sp : ddcd3c78 ip : 00000000 fp : 9d8980b8 [ 349.075610] r10: 00000000 r9 : 00000000 r8 : 00000000 [ 349.081090] r7 : 00001000 r6 : dd898000 r5 : 00000040 r4 : ddb10550 [ 349.087935] r3 : 00000004 r2 : 00000010 r1 : 53100080 r0 : 00000000 [ 349.094783] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 349.102268] Control: 10c5387d Table: 9deac019 DAC: 00000015 [ 349.108294] Process insmod (pid: 1473, stack limit = 0xddcd2248) [...] This is because polling_mode is not enabled for ctx without FLAGS_FINUP. For polling mode the bufcnt is made 0 unconditionally. But it should be made 0 only if it is a final update or a total is not zero(This condition is similar to what is done in DMA case). Because of this wrong hashes are produced. Fixing the same. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

ERROR: code indent should use tabs where possible torvalds#37: FILE: include/linux/mmdebug.h:33: + do {^I^I^I^I^I^I^I^I\$ WARNING: please, no spaces at the start of a line torvalds#37: FILE: include/linux/mmdebug.h:33: + do {^I^I^I^I^I^I^I^I\$ ERROR: code indent should use tabs where possible torvalds#38: FILE: include/linux/mmdebug.h:34: + if (unlikely(cond)) {^I^I^I^I^I\$ WARNING: please, no spaces at the start of a line torvalds#38: FILE: include/linux/mmdebug.h:34: + if (unlikely(cond)) {^I^I^I^I^I\$ ERROR: code indent should use tabs where possible torvalds#39: FILE: include/linux/mmdebug.h:35: + dump_mm(mm);^I^I^I^I^I\$ WARNING: please, no spaces at the start of a line torvalds#39: FILE: include/linux/mmdebug.h:35: + dump_mm(mm);^I^I^I^I^I\$ ERROR: code indent should use tabs where possible torvalds#40: FILE: include/linux/mmdebug.h:36: + BUG();^I^I^I^I^I^I\$ WARNING: please, no spaces at the start of a line torvalds#40: FILE: include/linux/mmdebug.h:36: + BUG();^I^I^I^I^I^I\$ ERROR: code indent should use tabs where possible torvalds#41: FILE: include/linux/mmdebug.h:37: + }^I^I^I^I^I^I^I\$ WARNING: please, no spaces at the start of a line torvalds#41: FILE: include/linux/mmdebug.h:37: + }^I^I^I^I^I^I^I\$ ERROR: code indent should use tabs where possible torvalds#42: FILE: include/linux/mmdebug.h:38: + } while (0)$ WARNING: please, no spaces at the start of a line torvalds#42: FILE: include/linux/mmdebug.h:38: + } while (0)$ WARNING: Prefer [subsystem eg: netdev]_alert([subsystem]dev, ... then dev_alert(dev, ... then pr_alert(... to printk(KERN_ALERT ... torvalds#74: FILE: mm/debug.c:171: + printk(KERN_ALERT total: 6 errors, 7 warnings, 109 lines checked NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or scripts/cleanfile ./patches/mm-introduce-vm_bug_on_mm.patch has style problems, please review. If any of these errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS. Please run checkpatch prior to sending patches Cc: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

This patch wires up the new syscall sys_bpf() on powerpc. Passes the tests in samples/bpf: #0 add+sub+mul OK #1 unreachable OK #2 unreachable2 OK #3 out of range jump OK #4 out of range jump2 OK #5 test1 ld_imm64 OK #6 test2 ld_imm64 OK #7 test3 ld_imm64 OK #8 test4 ld_imm64 OK #9 test5 ld_imm64 OK #10 no bpf_exit OK #11 loop (back-edge) OK #12 loop2 (back-edge) OK #13 conditional loop OK #14 read uninitialized register OK #15 read invalid register OK #16 program doesn't init R0 before exit OK #17 stack out of bounds OK #18 invalid call insn1 OK #19 invalid call insn2 OK #20 invalid function call OK #21 uninitialized stack1 OK #22 uninitialized stack2 OK #23 check valid spill/fill OK #24 check corrupted spill/fill OK #25 invalid src register in STX OK #26 invalid dst register in STX OK #27 invalid dst register in ST OK #28 invalid src register in LDX OK #29 invalid dst register in LDX OK #30 junk insn OK #31 junk insn2 OK #32 junk insn3 OK #33 junk insn4 OK #34 junk insn5 OK #35 misaligned read from stack OK #36 invalid map_fd for function call OK #37 don't check return value before access OK #38 access memory with incorrect alignment OK #39 sometimes access memory with incorrect alignment OK #40 jump test 1 OK #41 jump test 2 OK #42 jump test 3 OK #43 jump test 4 OK Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> [mpe: test using samples/bpf] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

WARNING: please, no space before tabs torvalds#38: FILE: lib/bitmap.c:1011: +^Iunsigned int n, m; ^I/* same meaning as in above comment */$ total: 0 errors, 1 warnings, 19 lines checked ./patches/lib-bitmap-update-bitmap_onto-to-unsigned.patch has style problems, please review. If any of these errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS. Please run checkpatch prior to sending patches Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

dmaengine: jz4780: Fix jz4780_dma_prep_dma_cyclic prototype

Nikolay has reported a hang when a memcg reclaim got stuck with the following backtrace: PID: 18308 TASK: ffff883d7c9b0a30 CPU: 1 COMMAND: "rsync" #0 [ffff88177374ac60] __schedule at ffffffff815ab152 #1 [ffff88177374acb0] schedule at ffffffff815ab76e #2 [ffff88177374acd0] schedule_timeout at ffffffff815ae5e5 #3 [ffff88177374ad70] io_schedule_timeout at ffffffff815aad6a #4 [ffff88177374ada0] bit_wait_io at ffffffff815abfc6 #5 [ffff88177374adb0] __wait_on_bit at ffffffff815abda5 torvalds#6 [ffff88177374ae00] wait_on_page_bit at ffffffff8111fd4f torvalds#7 [ffff88177374ae50] shrink_page_list at ffffffff81135445 torvalds#8 [ffff88177374af50] shrink_inactive_list at ffffffff81135845 torvalds#9 [ffff88177374b060] shrink_lruvec at ffffffff81135ead torvalds#10 [ffff88177374b150] shrink_zone at ffffffff811360c3 torvalds#11 [ffff88177374b220] shrink_zones at ffffffff81136eff torvalds#12 [ffff88177374b2a0] do_try_to_free_pages at ffffffff8113712f torvalds#13 [ffff88177374b300] try_to_free_mem_cgroup_pages at ffffffff811372be torvalds#14 [ffff88177374b380] try_charge at ffffffff81189423 torvalds#15 [ffff88177374b430] mem_cgroup_try_charge at ffffffff8118c6f5 torvalds#16 [ffff88177374b470] __add_to_page_cache_locked at ffffffff8112137d torvalds#17 [ffff88177374b4e0] add_to_page_cache_lru at ffffffff81121618 torvalds#18 [ffff88177374b510] pagecache_get_page at ffffffff8112170b torvalds#19 [ffff88177374b560] grow_dev_page at ffffffff811c8297 torvalds#20 [ffff88177374b5c0] __getblk_slow at ffffffff811c91d6 torvalds#21 [ffff88177374b600] __getblk_gfp at ffffffff811c92c1 torvalds#22 [ffff88177374b630] ext4_ext_grow_indepth at ffffffff8124565c torvalds#23 [ffff88177374b690] ext4_ext_create_new_leaf at ffffffff81246ca8 torvalds#24 [ffff88177374b6e0] ext4_ext_insert_extent at ffffffff81246f09 torvalds#25 [ffff88177374b750] ext4_ext_map_blocks at ffffffff8124a848 torvalds#26 [ffff88177374b870] ext4_map_blocks at ffffffff8121a5b7 torvalds#27 [ffff88177374b910] mpage_map_one_extent at ffffffff8121b1fa torvalds#28 [ffff88177374b950] mpage_map_and_submit_extent at ffffffff8121f07b torvalds#29 [ffff88177374b9b0] ext4_writepages at ffffffff8121f6d5 torvalds#30 [ffff88177374bb20] do_writepages at ffffffff8112c490 torvalds#31 [ffff88177374bb30] __filemap_fdatawrite_range at ffffffff81120199 torvalds#32 [ffff88177374bb80] filemap_flush at ffffffff8112041c torvalds#33 [ffff88177374bb90] ext4_alloc_da_blocks at ffffffff81219da1 torvalds#34 [ffff88177374bbb0] ext4_rename at ffffffff81229b91 torvalds#35 [ffff88177374bcd0] ext4_rename2 at ffffffff81229e32 torvalds#36 [ffff88177374bce0] vfs_rename at ffffffff811a08a5 torvalds#37 [ffff88177374bd60] SYSC_renameat2 at ffffffff811a3ffc torvalds#38 [ffff88177374bf60] sys_renameat2 at ffffffff811a408e torvalds#39 [ffff88177374bf70] sys_rename at ffffffff8119e51e torvalds#40 [ffff88177374bf80] system_call_fastpath at ffffffff815afa89 Dave Chinner has properly pointed out that this is a deadlock in the reclaim code because ext4 doesn't submit pages which are marked by PG_writeback right away. The heuristic was introduced by e62e384 ("memcg: prevent OOM with too many dirty pages") and it was applied only when may_enter_fs was specified. The code has been changed by c3b94f4 ("memcg: further prevent OOM with too many dirty pages") which has removed the __GFP_FS restriction with a reasoning that we do not get into the fs code. But this is not sufficient apparently because the fs doesn't necessarily submit pages marked PG_writeback for IO right away. ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily submit the bio. Instead it tries to map more pages into the bio and mpage_map_one_extent might trigger memcg charge which might end up waiting on a page which is marked PG_writeback but hasn't been submitted yet so we would end up waiting for something that never finishes. Fix this issue by replacing __GFP_IO by __GFP_FS check (for case 2) before we go to wait on the writeback. The page fault path, which is the only path that triggers memcg oom killer since 3.12, shouldn't require GFP_NOFS and so we shouldn't reintroduce the premature OOM killer issue which was originally addressed by the heuristic. As per David Chinner the xfs is doing similar thing since 2.6.15 already so ext4 is not the only affected filesystem. Moreover he notes: : For example: IO completion might require unwritten extent conversion : which executes filesystem transactions and GFP_NOFS allocations. The : writeback flag on the pages can not be cleared until unwritten : extent conversion completes. Hence memory reclaim cannot wait on : page writeback to complete in GFP_NOFS context because it is not : safe to do so, memcg reclaim or otherwise. Cc: stable # 3.6+ [tytso@mit.edu: check for __GFP_FS rather than __GFP_IO] Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages") Reported-by: Nikolay Borisov <kernel@kyup.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> --- mm/vmscan.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-)

Nikolay has reported a hang when a memcg reclaim got stuck with the following backtrace: PID: 18308 TASK: ffff883d7c9b0a30 CPU: 1 COMMAND: "rsync" #0 [ffff88177374ac60] __schedule at ffffffff815ab152 #1 [ffff88177374acb0] schedule at ffffffff815ab76e #2 [ffff88177374acd0] schedule_timeout at ffffffff815ae5e5 #3 [ffff88177374ad70] io_schedule_timeout at ffffffff815aad6a #4 [ffff88177374ada0] bit_wait_io at ffffffff815abfc6 #5 [ffff88177374adb0] __wait_on_bit at ffffffff815abda5 torvalds#6 [ffff88177374ae00] wait_on_page_bit at ffffffff8111fd4f torvalds#7 [ffff88177374ae50] shrink_page_list at ffffffff81135445 torvalds#8 [ffff88177374af50] shrink_inactive_list at ffffffff81135845 torvalds#9 [ffff88177374b060] shrink_lruvec at ffffffff81135ead torvalds#10 [ffff88177374b150] shrink_zone at ffffffff811360c3 torvalds#11 [ffff88177374b220] shrink_zones at ffffffff81136eff torvalds#12 [ffff88177374b2a0] do_try_to_free_pages at ffffffff8113712f torvalds#13 [ffff88177374b300] try_to_free_mem_cgroup_pages at ffffffff811372be torvalds#14 [ffff88177374b380] try_charge at ffffffff81189423 torvalds#15 [ffff88177374b430] mem_cgroup_try_charge at ffffffff8118c6f5 torvalds#16 [ffff88177374b470] __add_to_page_cache_locked at ffffffff8112137d torvalds#17 [ffff88177374b4e0] add_to_page_cache_lru at ffffffff81121618 torvalds#18 [ffff88177374b510] pagecache_get_page at ffffffff8112170b torvalds#19 [ffff88177374b560] grow_dev_page at ffffffff811c8297 torvalds#20 [ffff88177374b5c0] __getblk_slow at ffffffff811c91d6 torvalds#21 [ffff88177374b600] __getblk_gfp at ffffffff811c92c1 torvalds#22 [ffff88177374b630] ext4_ext_grow_indepth at ffffffff8124565c torvalds#23 [ffff88177374b690] ext4_ext_create_new_leaf at ffffffff81246ca8 torvalds#24 [ffff88177374b6e0] ext4_ext_insert_extent at ffffffff81246f09 torvalds#25 [ffff88177374b750] ext4_ext_map_blocks at ffffffff8124a848 torvalds#26 [ffff88177374b870] ext4_map_blocks at ffffffff8121a5b7 torvalds#27 [ffff88177374b910] mpage_map_one_extent at ffffffff8121b1fa torvalds#28 [ffff88177374b950] mpage_map_and_submit_extent at ffffffff8121f07b torvalds#29 [ffff88177374b9b0] ext4_writepages at ffffffff8121f6d5 torvalds#30 [ffff88177374bb20] do_writepages at ffffffff8112c490 torvalds#31 [ffff88177374bb30] __filemap_fdatawrite_range at ffffffff81120199 torvalds#32 [ffff88177374bb80] filemap_flush at ffffffff8112041c torvalds#33 [ffff88177374bb90] ext4_alloc_da_blocks at ffffffff81219da1 torvalds#34 [ffff88177374bbb0] ext4_rename at ffffffff81229b91 torvalds#35 [ffff88177374bcd0] ext4_rename2 at ffffffff81229e32 torvalds#36 [ffff88177374bce0] vfs_rename at ffffffff811a08a5 torvalds#37 [ffff88177374bd60] SYSC_renameat2 at ffffffff811a3ffc torvalds#38 [ffff88177374bf60] sys_renameat2 at ffffffff811a408e torvalds#39 [ffff88177374bf70] sys_rename at ffffffff8119e51e torvalds#40 [ffff88177374bf80] system_call_fastpath at ffffffff815afa89 Dave Chinner has properly pointed out that this is a deadlock in the reclaim code because ext4 doesn't submit pages which are marked by PG_writeback right away. The heuristic was introduced by e62e384 ("memcg: prevent OOM with too many dirty pages") and it was applied only when may_enter_fs was specified. The code has been changed by c3b94f4 ("memcg: further prevent OOM with too many dirty pages") which has removed the __GFP_FS restriction with a reasoning that we do not get into the fs code. But this is not sufficient apparently because the fs doesn't necessarily submit pages marked PG_writeback for IO right away. ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily submit the bio. Instead it tries to map more pages into the bio and mpage_map_one_extent might trigger memcg charge which might end up waiting on a page which is marked PG_writeback but hasn't been submitted yet so we would end up waiting for something that never finishes. Fix this issue by replacing __GFP_IO by __GFP_FS check (for case 2) before we go to wait on the writeback. The page fault path, which is the only path that triggers memcg oom killer since 3.12, shouldn't require GFP_NOFS and so we shouldn't reintroduce the premature OOM killer issue which was originally addressed by the heuristic. As per David Chinner the xfs is doing similar thing since 2.6.15 already so ext4 is not the only affected filesystem. Moreover he notes: : For example: IO completion might require unwritten extent conversion : which executes filesystem transactions and GFP_NOFS allocations. The : writeback flag on the pages can not be cleared until unwritten : extent conversion completes. Hence memory reclaim cannot wait on : page writeback to complete in GFP_NOFS context because it is not : safe to do so, memcg reclaim or otherwise. Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages") [tytso@mit.edu: check for __GFP_FS rather than __GFP_IO] Signed-off-by: Michal Hocko <mhocko@suse.cz> Reported-by: Nikolay Borisov <kernel@kyup.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Marian Marinov <mm@1h.com> Cc: Hugh Dickins <hughd@google.com> Cc: <stable@vger.kernel.org> [3.6+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Nikolay has reported a hang when a memcg reclaim got stuck with the following backtrace: PID: 18308 TASK: ffff883d7c9b0a30 CPU: 1 COMMAND: "rsync" #0 __schedule at ffffffff815ab152 #1 schedule at ffffffff815ab76e #2 schedule_timeout at ffffffff815ae5e5 #3 io_schedule_timeout at ffffffff815aad6a #4 bit_wait_io at ffffffff815abfc6 #5 __wait_on_bit at ffffffff815abda5 #6 wait_on_page_bit at ffffffff8111fd4f #7 shrink_page_list at ffffffff81135445 #8 shrink_inactive_list at ffffffff81135845 #9 shrink_lruvec at ffffffff81135ead #10 shrink_zone at ffffffff811360c3 #11 shrink_zones at ffffffff81136eff #12 do_try_to_free_pages at ffffffff8113712f #13 try_to_free_mem_cgroup_pages at ffffffff811372be #14 try_charge at ffffffff81189423 #15 mem_cgroup_try_charge at ffffffff8118c6f5 #16 __add_to_page_cache_locked at ffffffff8112137d #17 add_to_page_cache_lru at ffffffff81121618 #18 pagecache_get_page at ffffffff8112170b #19 grow_dev_page at ffffffff811c8297 #20 __getblk_slow at ffffffff811c91d6 #21 __getblk_gfp at ffffffff811c92c1 #22 ext4_ext_grow_indepth at ffffffff8124565c #23 ext4_ext_create_new_leaf at ffffffff81246ca8 #24 ext4_ext_insert_extent at ffffffff81246f09 #25 ext4_ext_map_blocks at ffffffff8124a848 #26 ext4_map_blocks at ffffffff8121a5b7 #27 mpage_map_one_extent at ffffffff8121b1fa #28 mpage_map_and_submit_extent at ffffffff8121f07b #29 ext4_writepages at ffffffff8121f6d5 #30 do_writepages at ffffffff8112c490 #31 __filemap_fdatawrite_range at ffffffff81120199 #32 filemap_flush at ffffffff8112041c #33 ext4_alloc_da_blocks at ffffffff81219da1 #34 ext4_rename at ffffffff81229b91 #35 ext4_rename2 at ffffffff81229e32 #36 vfs_rename at ffffffff811a08a5 #37 SYSC_renameat2 at ffffffff811a3ffc #38 sys_renameat2 at ffffffff811a408e #39 sys_rename at ffffffff8119e51e #40 system_call_fastpath at ffffffff815afa89 Dave Chinner has properly pointed out that this is a deadlock in the reclaim code because ext4 doesn't submit pages which are marked by PG_writeback right away. The heuristic was introduced by commit e62e384 ("memcg: prevent OOM with too many dirty pages") and it was applied only when may_enter_fs was specified. The code has been changed by c3b94f4 ("memcg: further prevent OOM with too many dirty pages") which has removed the __GFP_FS restriction with a reasoning that we do not get into the fs code. But this is not sufficient apparently because the fs doesn't necessarily submit pages marked PG_writeback for IO right away. ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily submit the bio. Instead it tries to map more pages into the bio and mpage_map_one_extent might trigger memcg charge which might end up waiting on a page which is marked PG_writeback but hasn't been submitted yet so we would end up waiting for something that never finishes. Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2) before we go to wait on the writeback. The page fault path, which is the only path that triggers memcg oom killer since 3.12, shouldn't require GFP_NOFS and so we shouldn't reintroduce the premature OOM killer issue which was originally addressed by the heuristic. As per David Chinner the xfs is doing similar thing since 2.6.15 already so ext4 is not the only affected filesystem. Moreover he notes: : For example: IO completion might require unwritten extent conversion : which executes filesystem transactions and GFP_NOFS allocations. The : writeback flag on the pages can not be cleared until unwritten : extent conversion completes. Hence memory reclaim cannot wait on : page writeback to complete in GFP_NOFS context because it is not : safe to do so, memcg reclaim or otherwise. Cc: stable@vger.kernel.org # 3.9+ [tytso@mit.edu: corrected the control flow] Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages") Reported-by: Nikolay Borisov <kernel@kyup.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

GIT 4469942 commit fc1a812 Author: Alex Williamson <alex.williamson@redhat.com> Date: Tue Aug 4 10:58:26 2015 -0600 KVM: MTRR: Use default type for non-MTRR-covered gfn before WARN_ON The patch was munged on commit to re-order these tests resulting in excessive warnings when trying to do device assignment. Return to original ordering: https://lkml.org/lkml/2015/7/15/769 Fixes: 3e5d2fd ("KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type") Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> commit ecf5fc6 Author: Michal Hocko <mhocko@suse.cz> Date: Tue Aug 4 14:36:58 2015 -0700 mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations Nikolay has reported a hang when a memcg reclaim got stuck with the following backtrace: PID: 18308 TASK: ffff883d7c9b0a30 CPU: 1 COMMAND: "rsync" #0 __schedule at ffffffff815ab152 #1 schedule at ffffffff815ab76e #2 schedule_timeout at ffffffff815ae5e5 #3 io_schedule_timeout at ffffffff815aad6a #4 bit_wait_io at ffffffff815abfc6 #5 __wait_on_bit at ffffffff815abda5 torvalds#6 wait_on_page_bit at ffffffff8111fd4f torvalds#7 shrink_page_list at ffffffff81135445 torvalds#8 shrink_inactive_list at ffffffff81135845 torvalds#9 shrink_lruvec at ffffffff81135ead torvalds#10 shrink_zone at ffffffff811360c3 torvalds#11 shrink_zones at ffffffff81136eff torvalds#12 do_try_to_free_pages at ffffffff8113712f torvalds#13 try_to_free_mem_cgroup_pages at ffffffff811372be torvalds#14 try_charge at ffffffff81189423 torvalds#15 mem_cgroup_try_charge at ffffffff8118c6f5 torvalds#16 __add_to_page_cache_locked at ffffffff8112137d torvalds#17 add_to_page_cache_lru at ffffffff81121618 torvalds#18 pagecache_get_page at ffffffff8112170b torvalds#19 grow_dev_page at ffffffff811c8297 torvalds#20 __getblk_slow at ffffffff811c91d6 torvalds#21 __getblk_gfp at ffffffff811c92c1 torvalds#22 ext4_ext_grow_indepth at ffffffff8124565c torvalds#23 ext4_ext_create_new_leaf at ffffffff81246ca8 torvalds#24 ext4_ext_insert_extent at ffffffff81246f09 torvalds#25 ext4_ext_map_blocks at ffffffff8124a848 torvalds#26 ext4_map_blocks at ffffffff8121a5b7 torvalds#27 mpage_map_one_extent at ffffffff8121b1fa torvalds#28 mpage_map_and_submit_extent at ffffffff8121f07b torvalds#29 ext4_writepages at ffffffff8121f6d5 torvalds#30 do_writepages at ffffffff8112c490 torvalds#31 __filemap_fdatawrite_range at ffffffff81120199 torvalds#32 filemap_flush at ffffffff8112041c torvalds#33 ext4_alloc_da_blocks at ffffffff81219da1 torvalds#34 ext4_rename at ffffffff81229b91 torvalds#35 ext4_rename2 at ffffffff81229e32 torvalds#36 vfs_rename at ffffffff811a08a5 torvalds#37 SYSC_renameat2 at ffffffff811a3ffc torvalds#38 sys_renameat2 at ffffffff811a408e torvalds#39 sys_rename at ffffffff8119e51e torvalds#40 system_call_fastpath at ffffffff815afa89 Dave Chinner has properly pointed out that this is a deadlock in the reclaim code because ext4 doesn't submit pages which are marked by PG_writeback right away. The heuristic was introduced by commit e62e384 ("memcg: prevent OOM with too many dirty pages") and it was applied only when may_enter_fs was specified. The code has been changed by c3b94f4 ("memcg: further prevent OOM with too many dirty pages") which has removed the __GFP_FS restriction with a reasoning that we do not get into the fs code. But this is not sufficient apparently because the fs doesn't necessarily submit pages marked PG_writeback for IO right away. ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily submit the bio. Instead it tries to map more pages into the bio and mpage_map_one_extent might trigger memcg charge which might end up waiting on a page which is marked PG_writeback but hasn't been submitted yet so we would end up waiting for something that never finishes. Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2) before we go to wait on the writeback. The page fault path, which is the only path that triggers memcg oom killer since 3.12, shouldn't require GFP_NOFS and so we shouldn't reintroduce the premature OOM killer issue which was originally addressed by the heuristic. As per David Chinner the xfs is doing similar thing since 2.6.15 already so ext4 is not the only affected filesystem. Moreover he notes: : For example: IO completion might require unwritten extent conversion : which executes filesystem transactions and GFP_NOFS allocations. The : writeback flag on the pages can not be cleared until unwritten : extent conversion completes. Hence memory reclaim cannot wait on : page writeback to complete in GFP_NOFS context because it is not : safe to do so, memcg reclaim or otherwise. Cc: stable@vger.kernel.org # 3.9+ [tytso@mit.edu: corrected the control flow] Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages") Reported-by: Nikolay Borisov <kernel@kyup.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> commit fcdf31a Author: Ross Lagerwall <ross.lagerwall@citrix.com> Date: Fri Jul 31 14:30:42 2015 +0100 xen/events/fifo: Handle linked events when closing a port An event channel bound to a CPU that was offlined may still be linked on that CPU's queue. If this event channel is closed and reused, subsequent events will be lost because the event channel is never unlinked and thus cannot be linked onto the correct queue. When a channel is closed and the event is still linked into a queue, ensure that it is unlinked before completing. If the CPU to which the event channel bound is online, spin until the event is handled by that CPU. If that CPU is offline, it can't handle the event, so clear the event queue during the close, dropping the events. This fixes the missing interrupts (and subsequent disk stalls etc.) when offlining a CPU. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Cc: <stable@vger.kernel.org> Signed-off-by: David Vrabel <david.vrabel@citrix.com> commit 6ea76f3 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Aug 3 17:24:11 2015 +0200 drm/atomic-helpers: Make encoder picking more robust We've had a few issues with atomic where subtle bugs in the encoder picking logic lead to accidental self-stealing of the encoder, resulting in a NULL connector_state->crtc in update_connector_routing and subsequent. Linus applied some duct-tape for an mst regression in commit 27667f4 Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Wed Jul 29 22:18:16 2015 -0700 i915: temporary fix for DP MST docking station NULL pointer dereference But that was incomplete (the code will still oops when debuggin is enabled) and mangled the state even further. So instead WARN and bail out as the more future-proof option. Cc: Theodore Ts'o <tytso@mit.edu> Cc: Linus Torvalds <torvalds@linux-foundation.org> Reviewed-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> commit 42639ba Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Aug 3 17:24:10 2015 +0200 drm/dp-mst: Remove debug WARN_ON Apparently been in there since forever and fairly easy to hit when hotplugging really fast. I can do that since my mst hub has a manual button to flick the hpd line for reprobing. The resulting WARNING spam isn't pretty. Cc: Dave Airlie <airlied@gmail.com> Cc: stable@vger.kernel.org Reviewed-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> commit 459485a Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Aug 3 17:24:09 2015 +0200 drm/i915: Fixup dp mst encoder selection In commit 8c7b5cc Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> Date: Tue Apr 21 17:13:19 2015 +0300 drm/i915: Use atomic helpers for computing changed flags we've switched over to the atomic version to compute the crtc->encoder->connector routing from the i915 variant. That one relies upon the ->best_encoder callback, but the i915-private version relied upon intel_find_encoder. Which didn't matter except for dp mst, where the encoder depends upon the selected crtc. Fix this functional bug by implemented a correct atomic-state based encoder selector for dp mst. Note that we can't get rid of the legacy best_encoder callback since the fbdev emulation uses that still. That means it's incorrect there still, but that's been the case ever since i915 dp mst support was merged so not a regression. Best to fix that by converting fbdev over to atomic too. Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> commit 3b8a684 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Mon Aug 3 17:24:08 2015 +0200 drm/atomic-helper: Add an atomice best_encoder callback With legacy helpers all the routing was already set up when calling best_encoder and so could be inspected. But with atomic it's staged, hence we need a new atomic compliant callback for drivers which need to inspect the requested state and can't just decided the best encoder statically. This is needed to fix up i915 dp mst where we need to pick the right encoder depending upon the requested CRTC for the connector. v2: Don't forget to amend the kerneldoc Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Theodore Ts'o <tytso@mit.edu> Acked-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> commit 5413fcd Author: Salvatore Mesoraca <s.mesoraca16@gmail.com> Date: Mon Aug 3 12:40:51 2015 +0200 Adding YAMA hooks also when YAMA is not stacked. Without this patch YAMA will not work at all if it is chosen as the primary LSM instead of being "stacked". Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: James Morris <james.l.morris@oracle.com> commit 49895bc Author: NeilBrown <neilb@suse.com> Date: Mon Aug 3 17:09:57 2015 +1000 md/raid5: don't let shrink_slab shrink too far. I have a report of drop_one_stripe() called from raid5_cache_scan() apparently finding ->max_nr_stripes == 0. This should not be allowed. So add a test to keep max_nr_stripes above min_nr_stripes. Also use a 'mask' rather than a 'mod' in drop_one_stripe to ensure 'hash' is valid even if max_nr_stripes does reach zero. Fixes: edbe83a ("md/raid5: allow the stripe_cache to grow and shrink.") Cc: stable@vger.kernel.org (4.1 - please release with 2d5b569) Reported-by: Tomas Papan <tomas.papan@gmail.com> Signed-off-by: NeilBrown <neilb@suse.com> commit b6878d9 Author: Benjamin Randazzo <benjamin@randazzo.fr> Date: Sat Jul 25 16:36:50 2015 +0200 md: use kzalloc() when bitmap is disabled In drivers/md/md.c get_bitmap_file() uses kmalloc() for creating a mdu_bitmap_file_t called "file". 5769 file = kmalloc(sizeof(*file), GFP_NOIO); 5770 if (!file) 5771 return -ENOMEM; This structure is copied to user space at the end of the function. 5786 if (err == 0 && 5787 copy_to_user(arg, file, sizeof(*file))) 5788 err = -EFAULT But if bitmap is disabled only the first byte of "file" is initialized with zero, so it's possible to read some bytes (up to 4095) of kernel space memory from user space. This is an information leak. 5775 /* bitmap disabled, zero the first byte and copy out */ 5776 if (!mddev->bitmap_info.file) 5777 file->pathname[0] = '\0'; Signed-off-by: Benjamin Randazzo <benjamin@randazzo.fr> Signed-off-by: NeilBrown <neilb@suse.com> commit 423f04d Author: NeilBrown <neilb@suse.com> Date: Mon Jul 27 11:48:52 2015 +1000 md/raid1: extend spinlock to protect raid1_end_read_request against inconsistencies raid1_end_read_request() assumes that the In_sync bits are consistent with the ->degaded count. raid1_spare_active updates the In_sync bit before the ->degraded count and so exposes an inconsistency, as does error() So extend the spinlock in raid1_spare_active() and error() to hide those inconsistencies. This should probably be part of Commit: 34cab6f ("md/raid1: fix test for 'was read error from last working device'.") as it addresses the same issue. It fixes the same bug and should go to -stable for same reasons. Fixes: 7607305 ("md/raid1: clean up read_balance.") Cc: stable@vger.kernel.org (v3.0+) Signed-off-by: NeilBrown <neilb@suse.com> commit e331146 Author: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Date: Mon Jul 27 17:30:48 2015 +0300 i2c: fix leaked device refcount on of_find_i2c_* error path If of_find_i2c_device_by_node() or of_find_i2c_adapter_by_node() find a device by node, but its type does not match, a reference to that device is still held. This change fixes the problem. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit 8fcd461 Author: Jeff Layton <jlayton@poochiereds.net> Date: Thu Jul 30 06:57:46 2015 -0400 nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid Currently, preprocess_stateid_op calls nfs4_check_olstateid which verifies that the open stateid corresponds to the current filehandle in the call by calling nfs4_check_fh. If the stateid is a NFS4_DELEG_STID however, then no such check is done. This could cause incorrect enforcement of permissions, because the nfsd_permission() call in nfs4_check_file uses current the current filehandle, but any subsequent IO operation will use the file descriptor in the stateid. Move the call to nfs4_check_fh into nfs4_check_file instead so that it can be done for all stateid types. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Cc: stable@vger.kernel.org [bfields: moved fh check to avoid NULL deref in special stateid case] Signed-off-by: J. Bruce Fields <bfields@redhat.com> commit e952849 Author: Masanari Iida <standby24x7@gmail.com> Date: Tue Jul 28 20:11:23 2015 +0900 i2c: Fix typo in i2c-bfin-twi.c This patch fix some typos found in a printk message and MODULE_DESCRIPTION. Signed-off-by: Masanari Iida <standby24x7@gmail.com> Acked-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit 828e66c Author: Jan Luebbe <jlu@pengutronix.de> Date: Wed Jul 8 16:35:27 2015 +0200 i2c: omap: fix bus recovery setup At least on the AM335x, enabling OMAP_I2C_SYSTEST_ST_EN is not enough to allow direct access to the SCL and SDA pins. In addition to ST_EN, we need to set the TMODE to 0b11 (Loop back & SDA/SCL IO mode select). Also, as the reset values of SCL_O and SDA_O are 0 (which means "drive low level"), we need to set them to 1 (which means "high-impedance") to avoid unwanted changes on the pins. As a precaution, reset all these bits to their default values after recovery is complete. Signed-off-by: Jan Luebbe <jlu@pengutronix.de> Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit 8b06260 Author: Jan Luebbe <jlu@pengutronix.de> Date: Wed Jul 8 16:35:06 2015 +0200 i2c: core: only use set_scl for bus recovery after calling prepare_recovery Using set_scl may be ineffective before calling the driver specific prepare_recovery callback, which might change into a test mode. So instead of setting SCL in i2c_generic_scl_recovery, move it to i2c_generic_recovery (after the optional prepare_recovery). Signed-off-by: Jan Luebbe <jlu@pengutronix.de> Acked-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit d12c0aa Author: Vladimir Zapolskiy <vz@mleia.com> Date: Mon Jul 27 00:18:51 2015 +0300 misc: eeprom: at24: clean up at24_bin_write() The change removes redundant sysfs binary file boundary check, since this task is already done on caller side in fs/sysfs/file.c Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit 1f02329 Author: Vladimir Zapolskiy <vz@mleia.com> Date: Mon Jul 27 00:16:31 2015 +0300 i2c: slave eeprom: clean up sysfs bin attribute read()/write() The change removes redundant sysfs binary file boundary checks, since this task is already done on caller side in fs/sysfs/file.c Note, on file size overflow read() now returns 0, and this is a correct and expected EOF notification according to POSIX. Signed-off-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> commit 2761713 Author: Ilya Dryomov <idryomov@gmail.com> Date: Thu Jul 16 17:36:11 2015 +0300 rbd: fix copyup completion race For write/discard obj_requests that involved a copyup method call, the opcode of the first op is CEPH_OSD_OP_CALL and the ->callback is rbd_img_obj_copyup_callback(). The latter frees copyup pages, sets ->xferred and delegates to rbd_img_obj_callback(), the "normal" image object callback, for reporting to block layer and putting refs. rbd_osd_req_callback() however treats CEPH_OSD_OP_CALL as a trivial op, which means obj_request is marked done in rbd_osd_trivial_callback(), *before* ->callback is invoked and rbd_img_obj_copyup_callback() has a chance to run. Marking obj_request done essentially means giving rbd_img_obj_callback() a license to end it at any moment, so if another obj_request from the same img_request is being completed concurrently, rbd_img_obj_end_request() may very well be called on such prematurally marked done request: <obj_request-1/2 reply> handle_reply() rbd_osd_req_callback() rbd_osd_trivial_callback() rbd_obj_request_complete() rbd_img_obj_copyup_callback() rbd_img_obj_callback() <obj_request-2/2 reply> handle_reply() rbd_osd_req_callback() rbd_osd_trivial_callback() for_each_obj_request(obj_request->img_request) { rbd_img_obj_end_request(obj_request-1/2) rbd_img_obj_end_request(obj_request-2/2) <-- } Calling rbd_img_obj_end_request() on such a request leads to trouble, in particular because its ->xfferred is 0. We report 0 to the block layer with blk_update_request(), get back 1 for "this request has more data in flight" and then trip on rbd_assert(more ^ (which == img_request->obj_request_count)); with rhs (which == ...) being 1 because rbd_img_obj_end_request() has been called for both requests and lhs (more) being 1 because we haven't got a chance to set ->xfferred in rbd_img_obj_copyup_callback() yet. To fix this, leverage that rbd wants to call class methods in only two cases: one is a generic method call wrapper (obj_request is standalone) and the other is a copyup (obj_request is part of an img_request). So make a dedicated handler for CEPH_OSD_OP_CALL and directly invoke rbd_img_obj_copyup_callback() from it if obj_request is part of an img_request, similar to how CEPH_OSD_OP_READ handler invokes rbd_img_obj_request_read_callback(). Since rbd_img_obj_copyup_callback() is now being called from the OSD request callback (only), it is renamed to rbd_osd_copyup_callback(). Cc: Alex Elder <elder@linaro.org> Cc: stable@vger.kernel.org # 3.10+, needs backporting for < 3.18 Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Alex Elder <elder@linaro.org> commit fc927cd Author: Yan, Zheng <zyan@redhat.com> Date: Mon Jul 20 09:50:58 2015 +0800 ceph: always re-send cap flushes when MDS recovers commit e548e9b makes the kclient only re-send cap flush once during MDS failover. If the kclient sends a cap flush after MDS enters reconnect stage but before MDS recovers. The kclient will skip re-sending the same cap flush when MDS recovers. This causes problem for newly created inode. The MDS handles cap flushes before replaying unsafe requests, so it's possible that MDS find corresponding inode is missing when handling cap flush. The fix is reverting to old behaviour: always re-send when MDS recovers Signed-off-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> commit f6762cb Author: Yan, Zheng <zyan@redhat.com> Date: Tue Jul 7 16:18:46 2015 +0800 ceph: fix ceph_encode_locks_to_buffer() posix locks should be in ctx->flc_posix list Signed-off-by: Yan, Zheng <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> commit 586b7cc Author: Christian Borntraeger <borntraeger@de.ibm.com> Date: Tue Jul 28 15:03:05 2015 +0200 KVM: s390: Fix hang VCPU hang/loop regression commit 785dbef ("KVM: s390: optimize round trip time in request handling") introduced a regression. This regression was seen with CPU hotplug in the guest and switching between 1 or 2 CPUs. This will set/reset the IBS control via synced request. Whenever we make a synced request, we first set the vcpu->requests bit and then block the vcpu. The handler, on the other hand, unblocks itself, processes vcpu->requests (by clearing them) and unblocks itself once again. Now, if the requester sleeps between setting of vcpu->requests and blocking, the handler will clear the vcpu->requests bit and try to unblock itself (although no bit is set). When the requester wakes up, it blocks the VCPU and we have a blocked VCPU without requests. Solution is to always unset the block bit. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Fixes: 785dbef ("KVM: s390: optimize round trip time in request handling") commit fe0d34d Author: Rusty Russell <rusty@rustcorp.com.au> Date: Wed Jul 29 05:52:14 2015 +0930 module: weaken locking assertion for oops path. We don't actually hold the module_mutex when calling find_module_all from module_kallsyms_lookup_name: that's because it's used by the oops code and we don't want to deadlock. However, access to the list read-only is safe if preempt is disabled, so we can weaken the assertion. Keep a strong version for external callers though. Fixes: 0be964b ("module: Sanitize RCU usage and locking") Reported-by: He Kuang <hekuang@huawei.com> Cc: stable@kernel.org Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> commit 17fb874 Author: Martin Schwidefsky <schwidefsky@de.ibm.com> Date: Fri Jul 24 13:13:30 2015 +0200 hwrng: core - correct error check of kthread_run call The kthread_run() function can return two different error values but the hwrng core only checks for -ENOMEM. If the other error value -EINTR is returned it is assigned to hwrng_fill and later used on a kthread_stop() call which naturally crashes. Cc: stable@vger.kernel.org Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> commit f898c52 Author: Herbert Xu <herbert@gondor.apana.org.au> Date: Wed Jul 22 18:05:35 2015 +0800 crypto: ixp4xx - Remove bogus BUG_ON on scattered dst buffer This patch removes a bogus BUG_ON in the ablkcipher path that triggers when the destination buffer is different from the source buffer and is scattered. Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> commit 6f043b5 Author: Tadeusz Struk <tadeusz.struk@intel.com> Date: Tue Jul 21 22:07:47 2015 -0700 crypto: qat - Fix invalid synchronization between register/unregister sym algs The synchronization method used atomic was bogus. Use a proper synchronization with mutex. Cc: stable@vger.kernel.org Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> commit 3d1450d Author: Jason A. Donenfeld <Jason@zx2c4.com> Date: Tue Jul 7 20:26:07 2015 +0200 Makefile: Force gzip and xz on module install Running `make modules_install` ordinarily will overwrite existing modules. This is the desired behavior, and is how pretty much every other `make install` target works. However, if CONFIG_MODULE_COMPRESS is enabled, modules are passed through gzip and xz which then do the file writing. Both gzip and xz will error out if the file already exists, unless -f is passed. This patch adds -f so that the behavior is uniform. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Michal Marek <mmarek@suse.com> commit 6dd3f13 Author: Michal Marek <mmarek@suse.com> Date: Thu Jul 16 18:23:53 2015 +0200 kbuild: Do not pick up ARCH_{CPP,A,C}FLAGS from the environment Initialize the ARCH_* overrides before including the arch Makefile, to avoid picking up the values from the environment. The variables can still be overriden on the make command line, but this won't happen by accident. Signed-off-by: Michal Marek <mmarek@suse.com> commit 1ca4b88 Author: Kinglong Mee <kinglongmee@gmail.com> Date: Thu Jul 9 17:38:26 2015 +0800 nfsd: Fix a file leak on nfsd4_layout_setlease failure If nfsd4_layout_setlease fails, nfsd will not put ls->ls_file. Fix commit c5c707f "nfsd: implement pNFS layout recalls". Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> commit c2227a3 Author: Kinglong Mee <kinglongmee@gmail.com> Date: Tue Jul 7 10:16:37 2015 +0800 nfsd: Drop BUG_ON and ignore SECLABEL on absent filesystem On an absent filesystem (one served by another server), we need to be able to handle requests for certain attributest (like fs_locations, so the client can find out which server does have the filesystem), but others we can't. We forgot to take that into account when adding another attribute bitmask work for the SECURITY_LABEL attribute. There an export entry with the "refer" option can result in: [ 88.414272] kernel BUG at fs/nfsd/nfs4xdr.c:2249! [ 88.414828] invalid opcode: 0000 [#1] SMP [ 88.415368] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache nfsd xfs libcrc32c iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi iosf_mbi ppdev btrfs coretemp crct10dif_pclmul crc32_pclmul crc32c_intel xor ghash_clmulni_intel raid6_pq vmw_balloon parport_pc parport i2c_piix4 shpchp vmw_vmci acpi_cpufreq auth_rpcgss nfs_acl lockd grace sunrpc vmwgfx drm_kms_helper ttm drm mptspi mptscsih serio_raw mptbase e1000 scsi_transport_spi ata_generic pata_acpi [last unloaded: nfsd] [ 88.417827] CPU: 0 PID: 2116 Comm: nfsd Not tainted 4.0.7-300.fc22.x86_64 #1 [ 88.418448] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/20/2014 [ 88.419093] task: ffff880079146d50 ti: ffff8800785d8000 task.ti: ffff8800785d8000 [ 88.419729] RIP: 0010:[<ffffffffa04b3c10>] [<ffffffffa04b3c10>] nfsd4_encode_fattr+0x820/0x1f00 [nfsd] [ 88.420376] RSP: 0000:ffff8800785db998 EFLAGS: 00010206 [ 88.421027] RAX: 0000000000000001 RBX: 000000000018091a RCX: ffff88006668b980 [ 88.421676] RDX: 00000000fffef7fc RSI: 0000000000000000 RDI: ffff880078d05000 [ 88.422315] RBP: ffff8800785dbb58 R08: ffff880078d043f8 R09: ffff880078d4a000 [ 88.422968] R10: 0000000000010000 R11: 0000000000000002 R12: 0000000000b0a23a [ 88.423612] R13: ffff880078d05000 R14: ffff880078683100 R15: ffff88006668b980 [ 88.424295] FS: 0000000000000000(0000) GS:ffff88007c600000(0000) knlGS:0000000000000000 [ 88.424944] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.425597] CR2: 00007f40bc370f90 CR3: 0000000035af5000 CR4: 00000000001407f0 [ 88.426285] Stack: [ 88.426921] ffff8800785dbaa8 ffffffffa049e4af ffff8800785dba08 ffffffff813298f0 [ 88.427585] ffff880078683300 ffff8800769b0de8 0000089d00000001 0000000087f805e0 [ 88.428228] ffff880000000000 ffff880079434a00 0000000000000000 ffff88006668b980 [ 88.428877] Call Trace: [ 88.429527] [<ffffffffa049e4af>] ? exp_get_by_name+0x7f/0xb0 [nfsd] [ 88.430168] [<ffffffff813298f0>] ? inode_doinit_with_dentry+0x210/0x6a0 [ 88.430807] [<ffffffff8123833e>] ? d_lookup+0x2e/0x60 [ 88.431449] [<ffffffff81236133>] ? dput+0x33/0x230 [ 88.432097] [<ffffffff8123f214>] ? mntput+0x24/0x40 [ 88.432719] [<ffffffff812272b2>] ? path_put+0x22/0x30 [ 88.433340] [<ffffffffa049ac87>] ? nfsd_cross_mnt+0xb7/0x1c0 [nfsd] [ 88.433954] [<ffffffffa04b54e0>] nfsd4_encode_dirent+0x1b0/0x3d0 [nfsd] [ 88.434601] [<ffffffffa04b5330>] ? nfsd4_encode_getattr+0x40/0x40 [nfsd] [ 88.435172] [<ffffffffa049c991>] nfsd_readdir+0x1c1/0x2a0 [nfsd] [ 88.435710] [<ffffffffa049a530>] ? nfsd_direct_splice_actor+0x20/0x20 [nfsd] [ 88.436447] [<ffffffffa04abf30>] nfsd4_encode_readdir+0x120/0x220 [nfsd] [ 88.437011] [<ffffffffa04b58cd>] nfsd4_encode_operation+0x7d/0x190 [nfsd] [ 88.437566] [<ffffffffa04aa6dd>] nfsd4_proc_compound+0x24d/0x6f0 [nfsd] [ 88.438157] [<ffffffffa0496103>] nfsd_dispatch+0xc3/0x220 [nfsd] [ 88.438680] [<ffffffffa006f0cb>] svc_process_common+0x43b/0x690 [sunrpc] [ 88.439192] [<ffffffffa0070493>] svc_process+0x103/0x1b0 [sunrpc] [ 88.439694] [<ffffffffa0495a57>] nfsd+0x117/0x190 [nfsd] [ 88.440194] [<ffffffffa0495940>] ? nfsd_destroy+0x90/0x90 [nfsd] [ 88.440697] [<ffffffff810bb728>] kthread+0xd8/0xf0 [ 88.441260] [<ffffffff810bb650>] ? kthread_worker_fn+0x180/0x180 [ 88.441762] [<ffffffff81789e58>] ret_from_fork+0x58/0x90 [ 88.442322] [<ffffffff810bb650>] ? kthread_worker_fn+0x180/0x180 [ 88.442879] Code: 0f 84 93 05 00 00 83 f8 ea c7 85 a0 fe ff ff 00 00 27 30 0f 84 ba fe ff ff 85 c0 0f 85 a5 fe ff ff e9 e3 f9 ff ff 0f 1f 44 00 00 <0f> 0b 66 0f 1f 44 00 00 be 04 00 00 00 4c 89 ef 4c 89 8d 68 fe [ 88.444052] RIP [<ffffffffa04b3c10>] nfsd4_encode_fattr+0x820/0x1f00 [nfsd] [ 88.444658] RSP <ffff8800785db998> [ 88.445232] ---[ end trace 6cb9d0487d94a29f ]--- Signed-off-by: Kinglong Mee <kinglongmee@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com> commit 929423f Author: Juergen Gross <jgross@suse.com> Date: Mon Jul 20 13:49:39 2015 +0200 xen: release lock occasionally during ballooning When dom0 is being ballooned balloon_process() will hold the balloon mutex until it is finished. This will block e.g. creation of new domains as the device backends for the new domain need some autoballooned pages for the ring buffers. Avoid this by releasing the balloon mutex from time to time during ballooning. Adjust the comment above balloon_process() regarding multiple instances of balloon_process(). Instead of open coding it, just use cond_resched(). Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com> commit c9ddbac Author: Michael S. Tsirkin <mst@redhat.com> Date: Tue Jul 14 18:27:46 2015 -0500 PCI: Restore PCI_MSIX_FLAGS_BIRMASK definition 09a2c73 ("PCI: Remove unused PCI_MSIX_FLAGS_BIRMASK definition") removed PCI_MSIX_FLAGS_BIRMASK from an exported header because it was unused in the kernel. But that breaks user programs that were using it (QEMU in particular). Restore the PCI_MSIX_FLAGS_BIRMASK definition. [bhelgaas: changelog] Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v3.13+ commit 30b03d0 Author: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Date: Fri Jun 26 03:28:24 2015 +0200 xen/gntdevt: Fix race condition in gntdev_release() While gntdev_release() is called the MMU notifier is still registered and can traverse priv->maps list even if no pages are mapped (which is the case -- gntdev_release() is called after all). But gntdev_release() will clear that list, so make sure that only one of those things happens at the same time. Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Cc: <stable@vger.kernel.org> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

commit ecf5fc6 upstream. Nikolay has reported a hang when a memcg reclaim got stuck with the following backtrace: PID: 18308 TASK: ffff883d7c9b0a30 CPU: 1 COMMAND: "rsync" #0 __schedule at ffffffff815ab152 #1 schedule at ffffffff815ab76e #2 schedule_timeout at ffffffff815ae5e5 #3 io_schedule_timeout at ffffffff815aad6a #4 bit_wait_io at ffffffff815abfc6 #5 __wait_on_bit at ffffffff815abda5 torvalds#6 wait_on_page_bit at ffffffff8111fd4f torvalds#7 shrink_page_list at ffffffff81135445 torvalds#8 shrink_inactive_list at ffffffff81135845 torvalds#9 shrink_lruvec at ffffffff81135ead torvalds#10 shrink_zone at ffffffff811360c3 torvalds#11 shrink_zones at ffffffff81136eff torvalds#12 do_try_to_free_pages at ffffffff8113712f torvalds#13 try_to_free_mem_cgroup_pages at ffffffff811372be torvalds#14 try_charge at ffffffff81189423 torvalds#15 mem_cgroup_try_charge at ffffffff8118c6f5 torvalds#16 __add_to_page_cache_locked at ffffffff8112137d torvalds#17 add_to_page_cache_lru at ffffffff81121618 torvalds#18 pagecache_get_page at ffffffff8112170b torvalds#19 grow_dev_page at ffffffff811c8297 torvalds#20 __getblk_slow at ffffffff811c91d6 torvalds#21 __getblk_gfp at ffffffff811c92c1 torvalds#22 ext4_ext_grow_indepth at ffffffff8124565c torvalds#23 ext4_ext_create_new_leaf at ffffffff81246ca8 torvalds#24 ext4_ext_insert_extent at ffffffff81246f09 torvalds#25 ext4_ext_map_blocks at ffffffff8124a848 torvalds#26 ext4_map_blocks at ffffffff8121a5b7 torvalds#27 mpage_map_one_extent at ffffffff8121b1fa torvalds#28 mpage_map_and_submit_extent at ffffffff8121f07b torvalds#29 ext4_writepages at ffffffff8121f6d5 torvalds#30 do_writepages at ffffffff8112c490 torvalds#31 __filemap_fdatawrite_range at ffffffff81120199 torvalds#32 filemap_flush at ffffffff8112041c torvalds#33 ext4_alloc_da_blocks at ffffffff81219da1 torvalds#34 ext4_rename at ffffffff81229b91 torvalds#35 ext4_rename2 at ffffffff81229e32 torvalds#36 vfs_rename at ffffffff811a08a5 torvalds#37 SYSC_renameat2 at ffffffff811a3ffc torvalds#38 sys_renameat2 at ffffffff811a408e torvalds#39 sys_rename at ffffffff8119e51e torvalds#40 system_call_fastpath at ffffffff815afa89 Dave Chinner has properly pointed out that this is a deadlock in the reclaim code because ext4 doesn't submit pages which are marked by PG_writeback right away. The heuristic was introduced by commit e62e384 ("memcg: prevent OOM with too many dirty pages") and it was applied only when may_enter_fs was specified. The code has been changed by c3b94f4 ("memcg: further prevent OOM with too many dirty pages") which has removed the __GFP_FS restriction with a reasoning that we do not get into the fs code. But this is not sufficient apparently because the fs doesn't necessarily submit pages marked PG_writeback for IO right away. ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily submit the bio. Instead it tries to map more pages into the bio and mpage_map_one_extent might trigger memcg charge which might end up waiting on a page which is marked PG_writeback but hasn't been submitted yet so we would end up waiting for something that never finishes. Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2) before we go to wait on the writeback. The page fault path, which is the only path that triggers memcg oom killer since 3.12, shouldn't require GFP_NOFS and so we shouldn't reintroduce the premature OOM killer issue which was originally addressed by the heuristic. As per David Chinner the xfs is doing similar thing since 2.6.15 already so ext4 is not the only affected filesystem. Moreover he notes: : For example: IO completion might require unwritten extent conversion : which executes filesystem transactions and GFP_NOFS allocations. The : writeback flag on the pages can not be cleared until unwritten : extent conversion completes. Hence memory reclaim cannot wait on : page writeback to complete in GFP_NOFS context because it is not : safe to do so, memcg reclaim or otherwise. Cc: stable@vger.kernel.org # 3.9+ [tytso@mit.edu: corrected the control flow] Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages") Reported-by: Nikolay Borisov <kernel@kyup.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit c2dbe32 upstream. If a non-root cgroup gets removed when there is a thread that registered trigger and is polling on a pressure file within the cgroup, the polling waitqueue gets freed in the following path: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pressure_release psi_trigger_destroy However, the polling thread still has a reference to the pressure file and will access the freed waitqueue when the file is closed or upon exit: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue This results in use-after-free as pasted below. The fundamental problem here is that cgroup_file_release() (and consequently waitqueue's lifetime) is not tied to the file's real lifetime. Using wake_up_pollfree() here might be less than ideal, but it is in line with the comment at commit 42288cb ("wait: add wake_up_pollfree()") since the waitqueue's lifetime is not tied to file's one and can be considered as another special case. While this would be fixable by somehow making cgroup_file_release() be tied to the fput(), it would require sizable refactoring at cgroups or higher layer which might be more justifiable if we identify more cases like this. BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0 Write of size 4 at addr ffff88810e625328 by task a.out/4404 CPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 torvalds#38 Hardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017 Call Trace: <TASK> dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0xc0 remove_wait_queue+0x1a/0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch_do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20/0x40 do_syscall_64+0x52/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Allocated by task 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 pressure_write+0x146/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 kernfs_remove_by_name_ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Fixes: 0e94682 ("psi: introduce psi monitor") Signed-off-by: Munehisa Kamata <kamatam@amazon.com> Signed-off-by: Mengchi Cheng <mengcc@amazon.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/20230106224859.4123476-1-kamatam@amazon.com/ Link: https://lore.kernel.org/r/20230214212705.4058045-1-kamatam@amazon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

…ress ACPICA commit c14708336bd18552b28643575de7b5beb9b864e9 Before this change we see the following UBSAN stack trace in Fuchsia: #0 0x0000220c98288eba in acpi_rs_get_address_common(struct acpi_resource*, union aml_resource*) ../../third_party/acpica/source/components/resources/rsaddr.c:331 <platform-bus-x86.so>+0x8f6eba #1.2 0x000023625f46077f in ubsan_get_stack_trace() compiler-rt/lib/ubsan/ubsan_diag.cpp:41 <libclang_rt.asan.so>+0x3d77f #1.1 0x000023625f46077f in maybe_print_stack_trace() compiler-rt/lib/ubsan/ubsan_diag.cpp:51 <libclang_rt.asan.so>+0x3d77f #1 0x000023625f46077f in ~scoped_report() compiler-rt/lib/ubsan/ubsan_diag.cpp:387 <libclang_rt.asan.so>+0x3d77f #2 0x000023625f461385 in handletype_mismatch_impl() compiler-rt/lib/ubsan/ubsan_handlers.cpp:137 <libclang_rt.asan.so>+0x3e385 #3 0x000023625f460ead in compiler-rt/lib/ubsan/ubsan_handlers.cpp:142 <libclang_rt.asan.so>+0x3dead #4 0x0000220c98288eba in acpi_rs_get_address_common(struct acpi_resource*, union aml_resource*) ../../third_party/acpica/source/components/resources/rsaddr.c:331 <platform-bus-x86.so>+0x8f6eba #5 0x0000220c9828ea57 in acpi_rs_convert_aml_to_resource(struct acpi_resource*, union aml_resource*, struct acpi_rsconvert_info*) ../../third_party/acpica/source/components/resources/rsmisc.c:352 <platform-bus-x86.so>+0x8fca57 torvalds#6 0x0000220c9828992c in acpi_rs_convert_aml_to_resources(u8*, u32, u32, u8, void**) ../../third_party/acpica/source/components/resources/rslist.c:132 <platform-bus-x86.so>+0x8f792c torvalds#7 0x0000220c982d1cfc in acpi_ut_walk_aml_resources(struct acpi_walk_state*, u8*, acpi_size, acpi_walk_aml_callback, void**) ../../third_party/acpica/source/components/utilities/utresrc.c:234 <platform-bus-x86.so>+0x93fcfc torvalds#8 0x0000220c98281e46 in acpi_rs_create_resource_list(union acpi_operand_object*, struct acpi_buffer*) ../../third_party/acpica/source/components/resources/rscreate.c:199 <platform-bus-x86.so>+0x8efe46 torvalds#9 0x0000220c98293b51 in acpi_rs_get_method_data(acpi_handle, const char*, struct acpi_buffer*) ../../third_party/acpica/source/components/resources/rsutils.c:770 <platform-bus-x86.so>+0x901b51 torvalds#10 0x0000220c9829438d in acpi_walk_resources(acpi_handle, char*, acpi_walk_resource_callback, void*) ../../third_party/acpica/source/components/resources/rsxface.c:731 <platform-bus-x86.so>+0x90238d torvalds#11 0x0000220c97db272b in acpi::acpi_impl::walk_resources(acpi::acpi_impl*, acpi_handle, const char*, acpi::Acpi::resources_callable) ../../src/devices/board/lib/acpi/acpi-impl.cc:41 <platform-bus-x86.so>+0x42072b torvalds#12 0x0000220c97dcec59 in acpi::device_builder::gather_resources(acpi::device_builder*, acpi::Acpi*, fidl::any_arena&, acpi::Manager*, acpi::device_builder::gather_resources_callback) ../../src/devices/board/lib/acpi/device-builder.cc:52 <platform-bus-x86.so>+0x43cc59 torvalds#13 0x0000220c97f94a3f in acpi::Manager::configure_discovered_devices(acpi::Manager*) ../../src/devices/board/lib/acpi/manager.cc:75 <platform-bus-x86.so>+0x602a3f torvalds#14 0x0000220c97c642c7 in publish_acpi_devices(acpi::Manager*, zx_device_t*, zx_device_t*) ../../src/devices/board/drivers/x86/acpi-nswalk.cc:102 <platform-bus-x86.so>+0x2d22c7 torvalds#15 0x0000220c97caf3e6 in x86::X86::do_init(x86::X86*) ../../src/devices/board/drivers/x86/x86.cc:65 <platform-bus-x86.so>+0x31d3e6 torvalds#16 0x0000220c97cd72ae in λ(x86::X86::ddk_init::(anon class)*) ../../src/devices/board/drivers/x86/x86.cc:82 <platform-bus-x86.so>+0x3452ae torvalds#17 0x0000220c97cd7223 in fit::internal::target<(lambda at../../src/devices/board/drivers/x86/x86.cc:81:19), false, false, void>::invoke(void*) ../../sdk/lib/fit/include/lib/fit/internal/function.h:181 <platform-bus-x86.so>+0x345223 torvalds#18 0x0000220c97f48eb0 in fit::internal::function_base<16UL, false, void()>::invoke(const fit::internal::function_base<16UL, false, void ()>*) ../../sdk/lib/fit/include/lib/fit/internal/function.h:505 <platform-bus-x86.so>+0x5b6eb0 torvalds#19 0x0000220c97f48d2a in fit::function_impl<16UL, false, void()>::operator()(const fit::function_impl<16UL, false, void ()>*) ../../sdk/lib/fit/include/lib/fit/function.h:300 <platform-bus-x86.so>+0x5b6d2a torvalds#20 0x0000220c982f9245 in async::internal::retained_task::Handler(async_dispatcher_t*, async_task_t*, zx_status_t) ../../zircon/system/ulib/async/task.cc:25 <platform-bus-x86.so>+0x967245 torvalds#21 0x000022e2aa1cd91e in λ(const driver_runtime::Dispatcher::post_task::(anon class)*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, zx_status_t) ../../src/devices/bin/driver_runtime/dispatcher.cc:715 <libdriver_runtime.so>+0xed91e torvalds#22 0x000022e2aa1cd621 in fit::internal::target<(lambda at../../src/devices/bin/driver_runtime/dispatcher.cc:714:7), true, false, void, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request>>, int>::invoke(void*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, int) ../../sdk/lib/fit/include/lib/fit/internal/function.h:128 <libdriver_runtime.so>+0xed621 torvalds#23 0x000022e2aa1a8482 in fit::internal::function_base<24UL, true, void(std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request>>, int)>::invoke(const fit::internal::function_base<24UL, true, void (std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, int)>*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, int) ../../sdk/lib/fit/include/lib/fit/internal/function.h:505 <libdriver_runtime.so>+0xc8482 torvalds#24 0x000022e2aa1a80f8 in fit::callback_impl<24UL, true, void(std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request>>, int)>::operator()(fit::callback_impl<24UL, true, void (std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, int)>*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, int) ../../sdk/lib/fit/include/lib/fit/function.h:451 <libdriver_runtime.so>+0xc80f8 torvalds#25 0x000022e2aa17fc76 in driver_runtime::callback_request::Call(driver_runtime::callback_request*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >, zx_status_t) ../../src/devices/bin/driver_runtime/callback_request.h:67 <libdriver_runtime.so>+0x9fc76 torvalds#26 0x000022e2aa18c7ef in driver_runtime::Dispatcher::dispatch_callback(driver_runtime::Dispatcher*, std::__2::unique_ptr<driver_runtime::callback_request, std::__2::default_delete<driver_runtime::callback_request> >) ../../src/devices/bin/driver_runtime/dispatcher.cc:1093 <libdriver_runtime.so>+0xac7ef torvalds#27 0x000022e2aa18fd67 in driver_runtime::Dispatcher::dispatch_callbacks(driver_runtime::Dispatcher*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../src/devices/bin/driver_runtime/dispatcher.cc:1169 <libdriver_runtime.so>+0xafd67 torvalds#28 0x000022e2aa1bc9a2 in λ(const driver_runtime::Dispatcher::create_with_adder::(anon class)*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../src/devices/bin/driver_runtime/dispatcher.cc:338 <libdriver_runtime.so>+0xdc9a2 torvalds#29 0x000022e2aa1bc6d2 in fit::internal::target<(lambda at../../src/devices/bin/driver_runtime/dispatcher.cc:337:7), true, false, void, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter>>, fbl::ref_ptr<driver_runtime::Dispatcher>>::invoke(void*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../sdk/lib/fit/include/lib/fit/internal/function.h:128 <libdriver_runtime.so>+0xdc6d2 torvalds#30 0x000022e2aa1aa1e5 in fit::internal::function_base<8UL, true, void(std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter>>, fbl::ref_ptr<driver_runtime::Dispatcher>)>::invoke(const fit::internal::function_base<8UL, true, void (std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>)>*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../sdk/lib/fit/include/lib/fit/internal/function.h:505 <libdriver_runtime.so>+0xca1e5 torvalds#31 0x000022e2aa1a9e32 in fit::function_impl<8UL, true, void(std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter>>, fbl::ref_ptr<driver_runtime::Dispatcher>)>::operator()(const fit::function_impl<8UL, true, void (std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>)>*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../sdk/lib/fit/include/lib/fit/function.h:300 <libdriver_runtime.so>+0xc9e32 torvalds#32 0x000022e2aa193444 in driver_runtime::Dispatcher::event_waiter::invoke_callback(driver_runtime::Dispatcher::event_waiter*, std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, fbl::ref_ptr<driver_runtime::Dispatcher>) ../../src/devices/bin/driver_runtime/dispatcher.h:299 <libdriver_runtime.so>+0xb3444 torvalds#33 0x000022e2aa192feb in driver_runtime::Dispatcher::event_waiter::handle_event(std::__2::unique_ptr<driver_runtime::Dispatcher::event_waiter, std::__2::default_delete<driver_runtime::Dispatcher::event_waiter> >, async_dispatcher_t*, async::wait_base*, zx_status_t, zx_packet_signal_t const*) ../../src/devices/bin/driver_runtime/dispatcher.cc:1259 <libdriver_runtime.so>+0xb2feb torvalds#34 0x000022e2aa1bcf74 in async_loop_owned_event_handler<driver_runtime::Dispatcher::event_waiter>::handle_event(async_loop_owned_event_handler<driver_runtime::Dispatcher::event_waiter>*, async_dispatcher_t*, async::wait_base*, zx_status_t, zx_packet_signal_t const*) ../../src/devices/bin/driver_runtime/async_loop_owned_event_handler.h:59 <libdriver_runtime.so>+0xdcf74 torvalds#35 0x000022e2aa1bd1cb in async::wait_method<async_loop_owned_event_handler<driver_runtime::Dispatcher::event_waiter>, &async_loop_owned_event_handler<driver_runtime::Dispatcher::event_waiter>::handle_event>::call_handler(async_dispatcher_t*, async_wait_t*, zx_status_t, zx_packet_signal_t const*) ../../zircon/system/ulib/async/include/lib/async/cpp/wait.h:201 <libdriver_runtime.so>+0xdd1cb torvalds#36 0x000022e2aa2303a9 in async_loop_dispatch_wait(async_loop_t*, async_wait_t*, zx_status_t, zx_packet_signal_t const*) ../../zircon/system/ulib/async-loop/loop.c:381 <libdriver_runtime.so>+0x1503a9 torvalds#37 0x000022e2aa229a82 in async_loop_run_once(async_loop_t*, zx_time_t) ../../zircon/system/ulib/async-loop/loop.c:330 <libdriver_runtime.so>+0x149a82 torvalds#38 0x000022e2aa229102 in async_loop_run(async_loop_t*, zx_time_t, _Bool) ../../zircon/system/ulib/async-loop/loop.c:288 <libdriver_runtime.so>+0x149102 torvalds#39 0x000022e2aa22aeb7 in async_loop_run_thread(void*) ../../zircon/system/ulib/async-loop/loop.c:840 <libdriver_runtime.so>+0x14aeb7 torvalds#40 0x000041a874980f1c in start_c11(void*) ../../zircon/third_party/ulib/musl/pthread/pthread_create.c:55 <libc.so>+0xd7f1c torvalds#41 0x000041a874aabe8d in thread_trampoline(uintptr_t, uintptr_t) ../../zircon/system/ulib/runtime/thread.cc:100 <libc.so>+0x202e8d Link: acpica/acpica@c1470833 Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

If a non-root cgroup gets removed when there is a thread that registered trigger and is polling on a pressure file within the cgroup, the polling waitqueue gets freed in the following path: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pressure_release psi_trigger_destroy However, the polling thread still has a reference to the pressure file and will access the freed waitqueue when the file is closed or upon exit: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue This results in use-after-free as pasted below. The fundamental problem here is that cgroup_file_release() (and consequently waitqueue's lifetime) is not tied to the file's real lifetime. Using wake_up_pollfree() here might be less than ideal, but it is in line with the comment at commit 42288cb ("wait: add wake_up_pollfree()") since the waitqueue's lifetime is not tied to file's one and can be considered as another special case. While this would be fixable by somehow making cgroup_file_release() be tied to the fput(), it would require sizable refactoring at cgroups or higher layer which might be more justifiable if we identify more cases like this. BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0 Write of size 4 at addr ffff88810e625328 by task a.out/4404 CPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 torvalds#38 Hardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017 Call Trace: <TASK> dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0xc0 remove_wait_queue+0x1a/0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch_do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20/0x40 do_syscall_64+0x52/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Allocated by task 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 pressure_write+0x146/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 kernfs_remove_by_name_ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Fixes: 0e94682 ("psi: introduce psi monitor") Signed-off-by: Munehisa Kamata <kamatam@amazon.com> Signed-off-by: Mengchi Cheng <mengcc@amazon.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/20230106224859.4123476-1-kamatam@amazon.com/ Link: https://lore.kernel.org/r/20230214212705.4058045-1-kamatam@amazon.com

checkpatch.pl had a couple of formatting suggestions: - torvalds#38: Don't use multiple blank lines - torvalds#42: Missing a blank line after declarations - torvalds#282: Alignment should match open parenthesis Fixed these format suggestions, checkpatch.pl is a little cleaner now. Signed-off-by: Phillip Duncan <turtlekernelsanders@gmail.com>

…tect_depth commit 630f512 upstream. This oops manifests itself on the following hardware: 01:00.0 VGA compatible controller: NVIDIA Corporation G98M [GeForce G 103M] (rev a1) Oct 09 14:17:46 lp-sasha kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000 Oct 09 14:17:46 lp-sasha kernel: #PF: supervisor read access in kernel mode Oct 09 14:17:46 lp-sasha kernel: #PF: error_code(0x0000) - not-present page Oct 09 14:17:46 lp-sasha kernel: PGD 0 P4D 0 Oct 09 14:17:46 lp-sasha kernel: Oops: 0000 [#1] SMP PTI Oct 09 14:17:46 lp-sasha kernel: CPU: 1 PID: 191 Comm: systemd-udevd Not tainted 5.9.0-rc8-next-20201009 torvalds#38 Oct 09 14:17:46 lp-sasha kernel: Hardware name: Hewlett-Packard Compaq Presario CQ61 Notebook PC/306A, BIOS F.03 03/23/2009 Oct 09 14:17:46 lp-sasha kernel: RIP: 0010:nouveau_connector_detect_depth+0x71/0xc0 [nouveau] Oct 09 14:17:46 lp-sasha kernel: Code: 0a 00 00 48 8b 49 48 c7 87 b8 00 00 00 06 00 00 00 80 b9 4d 0a 00 00 00 75 1e 83 fa 41 75 05 48 85 c0 75 29 8b 81 10 0d 00 00 <39> 06 7c 25 f6 81 14 0d 00 00 02 75 b7 c3 80 b9 0c 0d 00 00 00 75 Oct 09 14:17:46 lp-sasha kernel: RSP: 0018:ffffc9000028f8c0 EFLAGS: 00010297 Oct 09 14:17:46 lp-sasha kernel: RAX: 0000000000014c08 RBX: ffff8880369d4000 RCX: ffff8880369d3000 Oct 09 14:17:46 lp-sasha kernel: RDX: 0000000000000040 RSI: 0000000000000000 RDI: ffff8880369d4000 Oct 09 14:17:46 lp-sasha kernel: RBP: ffff88800601cc00 R08: ffff8880051da298 R09: ffffffff8226201a Oct 09 14:17:46 lp-sasha kernel: R10: ffff88800469aa80 R11: ffff888004c84ff8 R12: 0000000000000000 Oct 09 14:17:46 lp-sasha kernel: R13: ffff8880051da000 R14: 0000000000002000 R15: 0000000000000003 Oct 09 14:17:46 lp-sasha kernel: FS: 00007fd0192b3440(0000) GS:ffff8880bc900000(0000) knlGS:0000000000000000 Oct 09 14:17:46 lp-sasha kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Oct 09 14:17:46 lp-sasha kernel: CR2: 0000000000000000 CR3: 0000000004976000 CR4: 00000000000006e0 Oct 09 14:17:46 lp-sasha kernel: Call Trace: Oct 09 14:17:46 lp-sasha kernel: nouveau_connector_get_modes+0x1e6/0x240 [nouveau] Oct 09 14:17:46 lp-sasha kernel: ? kfree+0xb9/0x240 Oct 09 14:17:46 lp-sasha kernel: ? drm_connector_list_iter_next+0x7c/0xa0 Oct 09 14:17:46 lp-sasha kernel: drm_helper_probe_single_connector_modes+0x1ba/0x7c0 Oct 09 14:17:46 lp-sasha kernel: drm_client_modeset_probe+0x27e/0x1360 Oct 09 14:17:46 lp-sasha kernel: ? nvif_object_sclass_put+0xc/0x20 [nouveau] Oct 09 14:17:46 lp-sasha kernel: ? nouveau_cli_init+0x3cc/0x440 [nouveau] Oct 09 14:17:46 lp-sasha kernel: ? ktime_get_mono_fast_ns+0x49/0xa0 Oct 09 14:17:46 lp-sasha kernel: ? nouveau_drm_open+0x4e/0x180 [nouveau] Oct 09 14:17:46 lp-sasha kernel: __drm_fb_helper_initial_config_and_unlock+0x3f/0x4a0 Oct 09 14:17:46 lp-sasha kernel: ? drm_file_alloc+0x18f/0x260 Oct 09 14:17:46 lp-sasha kernel: ? mutex_lock+0x9/0x40 Oct 09 14:17:46 lp-sasha kernel: ? drm_client_init+0x110/0x160 Oct 09 14:17:46 lp-sasha kernel: nouveau_fbcon_init+0x14d/0x1c0 [nouveau] Oct 09 14:17:46 lp-sasha kernel: nouveau_drm_device_init+0x1c0/0x880 [nouveau] Oct 09 14:17:46 lp-sasha kernel: nouveau_drm_probe+0x11a/0x1e0 [nouveau] Oct 09 14:17:46 lp-sasha kernel: pci_device_probe+0xcd/0x140 Oct 09 14:17:46 lp-sasha kernel: really_probe+0xd8/0x400 Oct 09 14:17:46 lp-sasha kernel: driver_probe_device+0x4a/0xa0 Oct 09 14:17:46 lp-sasha kernel: device_driver_attach+0x9c/0xc0 Oct 09 14:17:46 lp-sasha kernel: __driver_attach+0x6f/0x100 Oct 09 14:17:46 lp-sasha kernel: ? device_driver_attach+0xc0/0xc0 Oct 09 14:17:46 lp-sasha kernel: bus_for_each_dev+0x75/0xc0 Oct 09 14:17:46 lp-sasha kernel: bus_add_driver+0x106/0x1c0 Oct 09 14:17:46 lp-sasha kernel: driver_register+0x86/0xe0 Oct 09 14:17:46 lp-sasha kernel: ? 0xffffffffa044e000 Oct 09 14:17:46 lp-sasha kernel: do_one_initcall+0x48/0x1e0 Oct 09 14:17:46 lp-sasha kernel: ? _cond_resched+0x11/0x60 Oct 09 14:17:46 lp-sasha kernel: ? kmem_cache_alloc_trace+0x19c/0x1e0 Oct 09 14:17:46 lp-sasha kernel: do_init_module+0x57/0x220 Oct 09 14:17:46 lp-sasha kernel: __do_sys_finit_module+0xa0/0xe0 Oct 09 14:17:46 lp-sasha kernel: do_syscall_64+0x33/0x40 Oct 09 14:17:46 lp-sasha kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9 Oct 09 14:17:46 lp-sasha kernel: RIP: 0033:0x7fd01a060d5d Oct 09 14:17:46 lp-sasha kernel: Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e3 70 0c 00 f7 d8 64 89 01 48 Oct 09 14:17:46 lp-sasha kernel: RSP: 002b:00007ffc8ad38a98 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 Oct 09 14:17:46 lp-sasha kernel: RAX: ffffffffffffffda RBX: 0000563f6e7fd530 RCX: 00007fd01a060d5d Oct 09 14:17:46 lp-sasha kernel: RDX: 0000000000000000 RSI: 00007fd01a19f95d RDI: 000000000000000f Oct 09 14:17:46 lp-sasha kernel: RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000007 Oct 09 14:17:46 lp-sasha kernel: R10: 000000000000000f R11: 0000000000000246 R12: 00007fd01a19f95d Oct 09 14:17:46 lp-sasha kernel: R13: 0000000000000000 R14: 0000563f6e7fbc10 R15: 0000563f6e7fd530 Oct 09 14:17:46 lp-sasha kernel: Modules linked in: nouveau(+) ttm xt_string xt_mark xt_LOG vgem v4l2_dv_timings uvcvideo ulpi udf ts_kmp ts_fsm ts_bm snd_aloop sil164 qat_dh895xccvf nf_nat_sip nf_nat_irc nf_nat_ftp nf_nat nf_log_ipv6 nf_log_ipv4 nf_log_common ltc2990 lcd intel_qat input_leds i2c_mux gspca_main videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc drivetemp cuse fuse crc_itu_t coretemp ch7006 ath5k ath algif_hash Oct 09 14:17:46 lp-sasha kernel: CR2: 0000000000000000 Oct 09 14:17:46 lp-sasha kernel: ---[ end trace 0ddafe218ad30017 ]--- Oct 09 14:17:46 lp-sasha kernel: RIP: 0010:nouveau_connector_detect_depth+0x71/0xc0 [nouveau] Oct 09 14:17:46 lp-sasha kernel: Code: 0a 00 00 48 8b 49 48 c7 87 b8 00 00 00 06 00 00 00 80 b9 4d 0a 00 00 00 75 1e 83 fa 41 75 05 48 85 c0 75 29 8b 81 10 0d 00 00 <39> 06 7c 25 f6 81 14 0d 00 00 02 75 b7 c3 80 b9 0c 0d 00 00 00 75 Oct 09 14:17:46 lp-sasha kernel: RSP: 0018:ffffc9000028f8c0 EFLAGS: 00010297 Oct 09 14:17:46 lp-sasha kernel: RAX: 0000000000014c08 RBX: ffff8880369d4000 RCX: ffff8880369d3000 Oct 09 14:17:46 lp-sasha kernel: RDX: 0000000000000040 RSI: 0000000000000000 RDI: ffff8880369d4000 Oct 09 14:17:46 lp-sasha kernel: RBP: ffff88800601cc00 R08: ffff8880051da298 R09: ffffffff8226201a Oct 09 14:17:46 lp-sasha kernel: R10: ffff88800469aa80 R11: ffff888004c84ff8 R12: 0000000000000000 Oct 09 14:17:46 lp-sasha kernel: R13: ffff8880051da000 R14: 0000000000002000 R15: 0000000000000003 Oct 09 14:17:46 lp-sasha kernel: FS: 00007fd0192b3440(0000) GS:ffff8880bc900000(0000) knlGS:0000000000000000 Oct 09 14:17:46 lp-sasha kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Oct 09 14:17:46 lp-sasha kernel: CR2: 0000000000000000 CR3: 0000000004976000 CR4: 00000000000006e0 The disassembly: Code: 0a 00 00 48 8b 49 48 c7 87 b8 00 00 00 06 00 00 00 80 b9 4d 0a 00 00 00 75 1e 83 fa 41 75 05 48 85 c0 75 29 8b 81 10 0d 00 00 <39> 06 7c 25 f6 81 14 0d 00 00 02 75 b7 c3 80 b9 0c 0d 00 00 00 75 All code ======== 0: 0a 00 or (%rax),%al 2: 00 48 8b add %cl,-0x75(%rax) 5: 49 rex.WB 6: 48 c7 87 b8 00 00 00 movq $0x6,0xb8(%rdi) d: 06 00 00 00 11: 80 b9 4d 0a 00 00 00 cmpb $0x0,0xa4d(%rcx) 18: 75 1e jne 0x38 1a: 83 fa 41 cmp $0x41,%edx 1d: 75 05 jne 0x24 1f: 48 85 c0 test %rax,%rax 22: 75 29 jne 0x4d 24: 8b 81 10 0d 00 00 mov 0xd10(%rcx),%eax 2a:* 39 06 cmp %eax,(%rsi) <-- trapping instruction 2c: 7c 25 jl 0x53 2e: f6 81 14 0d 00 00 02 testb $0x2,0xd14(%rcx) 35: 75 b7 jne 0xffffffffffffffee 37: c3 retq 38: 80 b9 0c 0d 00 00 00 cmpb $0x0,0xd0c(%rcx) 3f: 75 .byte 0x75 Code starting with the faulting instruction =========================================== 0: 39 06 cmp %eax,(%rsi) 2: 7c 25 jl 0x29 4: f6 81 14 0d 00 00 02 testb $0x2,0xd14(%rcx) b: 75 b7 jne 0xffffffffffffffc4 d: c3 retq e: 80 b9 0c 0d 00 00 00 cmpb $0x0,0xd0c(%rcx) 15: 75 .byte 0x75 objdump -SF --disassemble=nouveau_connector_detect_depth [...] if (nv_connector->edid && c85e1: 83 fa 41 cmp $0x41,%edx c85e4: 75 05 jne c85eb <nouveau_connector_detect_depth+0x6b> (File Offset: 0xc866b) c85e6: 48 85 c0 test %rax,%rax c85e9: 75 29 jne c8614 <nouveau_connector_detect_depth+0x94> (File Offset: 0xc8694) nv_connector->type == DCB_CONNECTOR_LVDS_SPWG) duallink = ((u8 *)nv_connector->edid)[121] == 2; else duallink = mode->clock >= bios->fp.duallink_transition_clk; if ((!duallink && (bios->fp.strapless_is_24bit & 1)) || c85eb: 8b 81 10 0d 00 00 mov 0xd10(%rcx),%eax c85f1: 39 06 cmp %eax,(%rsi) c85f3: 7c 25 jl c861a <nouveau_connector_detect_depth+0x9a> (File Offset: 0xc869a) ( duallink && (bios->fp.strapless_is_24bit & 2))) c85f5: f6 81 14 0d 00 00 02 testb $0x2,0xd14(%rcx) c85fc: 75 b7 jne c85b5 <nouveau_connector_detect_depth+0x35> (File Offset: 0xc8635) connector->display_info.bpc = 8; [...] % scripts/faddr2line /lib/modules/5.9.0-rc8-next-20201009/kernel/drivers/gpu/drm/nouveau/nouveau.ko nouveau_connector_detect_depth+0x71/0xc0 nouveau_connector_detect_depth+0x71/0xc0: nouveau_connector_detect_depth at /home/sasha/linux-next/drivers/gpu/drm/nouveau/nouveau_connector.c:891 It is actually line 889. See the disassembly below. 889 duallink = mode->clock >= bios->fp.duallink_transition_clk; The NULL pointer being dereferenced is mode. Git bisect has identified the following commit as bad: f28e32d drm/nouveau/kms: Don't change EDID when it hasn't actually changed Here is the chain of events that causes the oops. On entry to nouveau_connector_detect_lvds, edid is set to NULL. The call to nouveau_connector_detect sets nv_connector->edid to valid memory, with status set to connector_status_connected and the flow of execution branching to the out label. The subsequent call to nouveau_connector_set_edid erronously clears nv_connector->edid, via the local edid pointer which remains set to NULL. Fix this by setting edid to the value of the just acquired nv_connector->edid and executing the body of nouveau_connector_set_edid only if nv_connector->edid and edid point to different memory addresses thus preventing nv_connector->edid from being turned into a dangling pointer. Fixes: f28e32d ("drm/nouveau/kms: Don't change EDID when it hasn't actually changed") Signed-off-by: Alexander Kapshuk <alexander.kapshuk@gmail.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

If a non-root cgroup gets removed when there is a thread that registered trigger and is polling on a pressure file within the cgroup, the polling waitqueue gets freed in the following path: do_rmdir cgroup_rmdir kernfs_drain_open_files cgroup_file_release cgroup_pressure_release psi_trigger_destroy However, the polling thread still has a reference to the pressure file and will access the freed waitqueue when the file is closed or upon exit: fput ep_eventpoll_release ep_free ep_remove_wait_queue remove_wait_queue This results in use-after-free as pasted below. The fundamental problem here is that cgroup_file_release() (and consequently waitqueue's lifetime) is not tied to the file's real lifetime. Using wake_up_pollfree() here might be less than ideal, but it is in line with the comment at commit 42288cb ("wait: add wake_up_pollfree()") since the waitqueue's lifetime is not tied to file's one and can be considered as another special case. While this would be fixable by somehow making cgroup_file_release() be tied to the fput(), it would require sizable refactoring at cgroups or higher layer which might be more justifiable if we identify more cases like this. BUG: KASAN: use-after-free in _raw_spin_lock_irqsave+0x60/0xc0 Write of size 4 at addr ffff88810e625328 by task a.out/4404 CPU: 19 PID: 4404 Comm: a.out Not tainted 6.2.0-rc6 torvalds#38 Hardware name: Amazon EC2 c5a.8xlarge/, BIOS 1.0 10/16/2017 Call Trace: <TASK> dump_stack_lvl+0x73/0xa0 print_report+0x16c/0x4e0 kasan_report+0xc3/0xf0 kasan_check_range+0x2d2/0x310 _raw_spin_lock_irqsave+0x60/0xc0 remove_wait_queue+0x1a/0xa0 ep_free+0x12c/0x170 ep_eventpoll_release+0x26/0x30 __fput+0x202/0x400 task_work_run+0x11d/0x170 do_exit+0x495/0x1130 do_group_exit+0x100/0x100 get_signal+0xd67/0xde0 arch_do_signal_or_restart+0x2a/0x2b0 exit_to_user_mode_prepare+0x94/0x100 syscall_exit_to_user_mode+0x20/0x40 do_syscall_64+0x52/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Allocated by task 4404: kasan_set_track+0x3d/0x60 __kasan_kmalloc+0x85/0x90 psi_trigger_create+0x113/0x3e0 pressure_write+0x146/0x2e0 cgroup_file_write+0x11c/0x250 kernfs_fop_write_iter+0x186/0x220 vfs_write+0x3d8/0x5c0 ksys_write+0x90/0x110 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4407: kasan_set_track+0x3d/0x60 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x11d/0x170 slab_free_freelist_hook+0x87/0x150 __kmem_cache_free+0xcb/0x180 psi_trigger_destroy+0x2e8/0x310 cgroup_file_release+0x4f/0xb0 kernfs_drain_open_files+0x165/0x1f0 kernfs_drain+0x162/0x1a0 __kernfs_remove+0x1fb/0x310 kernfs_remove_by_name_ns+0x95/0xe0 cgroup_addrm_files+0x67f/0x700 cgroup_destroy_locked+0x283/0x3c0 cgroup_rmdir+0x29/0x100 kernfs_iop_rmdir+0xd1/0x140 vfs_rmdir+0xfe/0x240 do_rmdir+0x13d/0x280 __x64_sys_rmdir+0x2c/0x30 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Fixes: 0e94682 ("psi: introduce psi monitor") Signed-off-by: Munehisa Kamata <kamatam@amazon.com> Signed-off-by: Mengchi Cheng <mengcc@amazon.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/lkml/20230106224859.4123476-1-kamatam@amazon.com/ Link: https://lore.kernel.org/r/20230214212705.4058045-1-kamatam@amazon.com

Merge in OBUDPST/udpst from udpst-ci-testing-framework to lc9892/feature/Multi-Flow-and-Random-Sizes * commit 'e17f6ead47b014d312431402a503a1a099ecf341': Updated test cases Initial testing framework for UDPST

Bpf next merge

KSAN calls into rcu code which then triggers a write that reenters into KSAN getting the system stuck doing infinite recursion. #0 kmsan_get_context () at mm/kmsan/kmsan.h:106 #1 __msan_get_context_state () at mm/kmsan/instrumentation.c:331 #2 0xffffffff81495671 in get_current () at ./arch/x86/include/asm/current.h:42 #3 rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 #4 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 #5 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#6 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#7 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#8 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#9 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#10 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#11 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#12 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#13 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#14 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#15 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#16 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#17 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#18 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#19 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#20 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#21 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#22 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#23 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#24 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#25 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#26 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#27 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#28 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#29 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#30 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#31 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#32 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#33 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#34 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#35 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#36 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#37 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#38 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#39 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#40 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#41 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#42 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#43 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#44 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#45 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#46 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#47 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#48 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#49 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#50 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#51 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 #52 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 #53 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#54 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#55 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#56 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#57 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 #58 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#59 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#60 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#61 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#62 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#63 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#64 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#65 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#66 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#67 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#68 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#69 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 #70 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#71 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#72 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#73 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#74 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#75 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#76 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#77 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff86203c90) at ./arch/x86/include/asm/kmsan.h:82 torvalds#78 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff86203c90) at mm/kmsan/shadow.c:75 torvalds#79 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff86203c90, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#80 kmsan_get_shadow_origin_ptr (address=0xffffffff86203c90, size=8, store=false) at mm/kmsan/shadow.c:97 torvalds#81 0xffffffff81b1dc72 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=8, store=false) at mm/kmsan/instrumentation.c:36 torvalds#82 __msan_metadata_ptr_for_load_8 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:92 torvalds#83 0xffffffff814fdb9e in filter_irq_stacks (entries=<optimized out>, nr_entries=4) at kernel/stacktrace.c:397 torvalds#84 0xffffffff829520e8 in stack_depot_save_flags (entries=0xffffffff8620d974 <init_task+1012>, nr_entries=4, alloc_flags=0, depot_flags=0) at lib/stackdepot.c:500 torvalds#85 0xffffffff81b1e560 in __msan_poison_alloca (address=0xffffffff86203da0, size=24, descr=<optimized out>) at mm/kmsan/instrumentation.c:285 torvalds#86 0xffffffff8562821c in _printk (fmt=0xffffffff85f191a5 "\0016Attempting lock1") at kernel/printk/printk.c:2324 torvalds#87 0xffffffff81942aa2 in kmem_cache_create_usercopy (name=0xffffffff85f18903 "mm_struct", size=1296, align=0, flags=270336, useroffset=<optimized out>, usersize=<optimized out>, ctor=0x0 <fixed_percpu_data>) at mm/slab_common.c:296 torvalds#88 0xffffffff86f337a0 in mm_cache_init () at kernel/fork.c:3262 torvalds#89 0xffffffff86eacb8e in start_kernel () at init/main.c:932 torvalds#90 0xffffffff86ecdf94 in x86_64_start_reservations (real_mode_data=0x140e0 <exception_stacks+28896> <error: Cannot access memory at address 0x140e0>) at arch/x86/kernel/head64.c:555 torvalds#91 0xffffffff86ecde9b in x86_64_start_kernel (real_mode_data=0x140e0 <exception_stacks+28896> <error: Cannot access memory at address 0x140e0>) at arch/x86/kernel/head64.c:536 torvalds#92 0xffffffff810001d3 in secondary_startup_64 () at /pool/workspace/linux/arch/x86/kernel/head_64.S:461 torvalds#93 0x0000000000000000 in ??

As of 5ec8e8e(mm/sparsemem: fix race in accessing memory_section->usage) KMSAN now calls into RCU tree code during kmsan_get_metadata. This will trigger a write that will reenter into KMSAN getting the system stuck doing infinite recursion. #0 kmsan_get_context () at mm/kmsan/kmsan.h:106 #1 __msan_get_context_state () at mm/kmsan/instrumentation.c:331 #2 0xffffffff81495671 in get_current () at ./arch/x86/include/asm/current.h:42 #3 rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 #4 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 #5 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#6 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#7 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#8 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#9 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#10 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#11 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#12 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#13 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#14 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#15 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#16 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#17 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#18 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#19 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#20 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#21 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#22 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#23 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#24 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#25 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#26 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#27 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#28 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#29 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#30 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#31 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#32 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#33 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#34 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#35 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#36 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#37 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#38 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#39 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#40 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#41 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#42 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#43 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#44 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#45 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#46 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#47 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#48 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#49 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#50 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#51 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 #52 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 #53 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#54 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#55 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#56 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#57 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 #58 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#59 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#60 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#61 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#62 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#63 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#64 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#65 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#66 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#67 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff8620d974 <init_task+1012>) at ./arch/x86/include/asm/kmsan.h:82 torvalds#68 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/shadow.c:75 torvalds#69 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff8620d974 <init_task+1012>, is_origin=false) at mm/kmsan/shadow.c:143 #70 kmsan_get_shadow_origin_ptr (address=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/shadow.c:97 torvalds#71 0xffffffff81b1dbd2 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=4, store=false) at mm/kmsan/instrumentation.c:36 torvalds#72 __msan_metadata_ptr_for_load_4 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:91 torvalds#73 0xffffffff8149568f in rcu_preempt_read_enter () at kernel/rcu/tree_plugin.h:379 torvalds#74 __rcu_read_lock () at kernel/rcu/tree_plugin.h:402 torvalds#75 0xffffffff81b2054b in rcu_read_lock () at ./include/linux/rcupdate.h:748 torvalds#76 pfn_valid (pfn=<optimized out>) at ./include/linux/mmzone.h:2016 torvalds#77 kmsan_virt_addr_valid (addr=addr@entry=0xffffffff86203c90) at ./arch/x86/include/asm/kmsan.h:82 torvalds#78 virt_to_page_or_null (vaddr=vaddr@entry=0xffffffff86203c90) at mm/kmsan/shadow.c:75 torvalds#79 0xffffffff81b2023c in kmsan_get_metadata (address=0xffffffff86203c90, is_origin=false) at mm/kmsan/shadow.c:143 torvalds#80 kmsan_get_shadow_origin_ptr (address=0xffffffff86203c90, size=8, store=false) at mm/kmsan/shadow.c:97 torvalds#81 0xffffffff81b1dc72 in get_shadow_origin_ptr (addr=0xffffffff8620d974 <init_task+1012>, size=8, store=false) at mm/kmsan/instrumentation.c:36 torvalds#82 __msan_metadata_ptr_for_load_8 (addr=0xffffffff8620d974 <init_task+1012>) at mm/kmsan/instrumentation.c:92 torvalds#83 0xffffffff814fdb9e in filter_irq_stacks (entries=<optimized out>, nr_entries=4) at kernel/stacktrace.c:397 torvalds#84 0xffffffff829520e8 in stack_depot_save_flags (entries=0xffffffff8620d974 <init_task+1012>, nr_entries=4, alloc_flags=0, depot_flags=0) at lib/stackdepot.c:500 torvalds#85 0xffffffff81b1e560 in __msan_poison_alloca (address=0xffffffff86203da0, size=24, descr=<optimized out>) at mm/kmsan/instrumentation.c:285 torvalds#86 0xffffffff8562821c in _printk (fmt=0xffffffff85f191a5 "\0016Attempting lock1") at kernel/printk/printk.c:2324 torvalds#87 0xffffffff81942aa2 in kmem_cache_create_usercopy (name=0xffffffff85f18903 "mm_struct", size=1296, align=0, flags=270336, useroffset=<optimized out>, usersize=<optimized out>, ctor=0x0 <fixed_percpu_data>) at mm/slab_common.c:296 torvalds#88 0xffffffff86f337a0 in mm_cache_init () at kernel/fork.c:3262 torvalds#89 0xffffffff86eacb8e in start_kernel () at init/main.c:932 torvalds#90 0xffffffff86ecdf94 in x86_64_start_reservations (real_mode_data=0x140e0 <exception_stacks+28896> <error: Cannot access memory at address 0x140e0>) at arch/x86/kernel/head64.c:555 torvalds#91 0xffffffff86ecde9b in x86_64_start_kernel (real_mode_data=0x140e0 <exception_stacks+28896> <error: Cannot access memory at address 0x140e0>) at arch/x86/kernel/head64.c:536 torvalds#92 0xffffffff810001d3 in secondary_startup_64 () at /pool/workspace/linux/arch/x86/kernel/head_64.S:461 torvalds#93 0x0000000000000000 in ??

Update ctx.h

da7115e

nmtigor reviewed Jun 20, 2013
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nmtigor closed this Jul 17, 2013

aejsmith pushed a commit to aejsmith/linux that referenced this pull request Jun 30, 2015

Merge pull request torvalds#38 from aejsmith/ci20-v3.18-dma

a1655e7

dmaengine: jz4780: Fix jz4780_dma_prep_dma_cyclic prototype

logic10492 pushed a commit to logic10492/linux-amd-zen2 that referenced this pull request Jan 18, 2024

Merge pull request torvalds#38 from sched-ext/bpf-next-merge

ce175af

Bpf next merge

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fix ctx.h #38

fix ctx.h #38

nmtigor commented Jun 19, 2013

nmtigor Jun 20, 2013

fix ctx.h #38

fix ctx.h #38

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nmtigor commented Jun 19, 2013

nmtigor Jun 20, 2013

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