[4.11] kernel panics on uni-processor configuration

[gschukin]

Hi Andi,

I observe the following panic on uni-processor VM, with binutils 2.27 and gcc 6.3.1:

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.11.0-0.rc7.git0.1.ptlto2.fc26.x86_64 root=UUID=9be70055-35f2-4a57-b120-5a003dfdb504 ro no_timer_check console=tty1 console=ttyS0,115200n8 rhgb console=ttyS1 LANG=en_US.UTF-8 initrd=/boot/initramfs-4.11.0-0.rc7.git0.1.ptlto2.fc26.x86_64.img
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007ffddfff] usable
[    0.000000] BIOS-e820: [mem 0x000000007ffde000-0x000000007fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000b0000000-0x00000000bfffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000087fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.9.3-1.fc25 04/01/2014
[    0.000000] Hypervisor detected: KVM
[    0.000000] e820: last_pfn = 0x880000 max_arch_pfn = 0x400000000
[    0.000000] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WC  UC- WT  
[    0.000000] e820: last_pfn = 0x7ffde max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000f6b90-0x000f6b9f] mapped at [ffff9578c00f6b90]
[    0.000000] RAMDISK: [mem 0x7f142000-0x7ffddfff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6970 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000007FFE2067 000030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000007FFE1F3F 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000007FFE0040 001EFF (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000007FFE0000 000040
[    0.000000] ACPI: APIC 0x000000007FFE1FB3 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: MCFG 0x000000007FFE202B 00003C (v01 BOCHS  BXPCMCFG 00000001 BXPC 00000001)
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000087fffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x87ffb8000-0x87ffe2fff]
[    0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
[    0.000000] kvm-clock: cpu 0, msr 8:7ff38001, primary cpu clock
[    0.000000] kvm-clock: using sched offset of 21219189112 cycles
[    0.000000] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
[    0.000000]   Normal   [mem 0x0000000100000000-0x000000087fffffff]
[    0.000000]   Device   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000007ffddfff]
[    0.000000]   node   0: [mem 0x0000000100000000-0x000000087fffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000087fffffff]
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] e820: [mem 0xc0000000-0xfed1bfff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on KVM
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] percpu: Embedded 34 pages/cpu @ffff95813fc00000 s101144 r8192 d29928 u2097152
[    0.000000] KVM setup async PF for cpu 0
[    0.000000] kvm-stealtime: cpu 0, msr 87fc12e00
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 8257383
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.11.0-0.rc7.git0.1.ptlto2.fc26.x86_64 root=UUID=9be70055-35f2-4a57-b120-5a003dfdb504 ro no_timer_check console=tty1 console=ttyS0,115200n8 rhgb console=ttyS1 LANG=en_US.UTF-8 initrd=/boot/initramfs-4.11.0-0.rc7.git0.1.ptlto2.fc26.x86_64.img
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Memory: 32930624K/33553904K available (7022K kernel code, 1445K rwdata, 2340K rodata, 1624K init, 1552K bss, 623280K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.001000] Hierarchical RCU implementation.
[    0.001000] 	Build-time adjustment of leaf fanout to 64.
[    0.001000] 	RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1.
[    0.001000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=1
[    0.001000] NR_IRQS:524544 nr_irqs:256 16
[    0.001000] 	Offload RCU callbacks from all CPUs
[    0.001000] 	Offload RCU callbacks from CPUs: 0.
[    0.001000] Console: colour VGA+ 80x25
[    0.001000] console [tty1] enabled
[    0.001000] console [ttyS0] enabled
[    0.001004] tsc: Detected 2198.724 MHz processor
[    0.001828] Calibrating delay loop (skipped) preset value.. 4397.44 BogoMIPS (lpj=2198724)
[    0.002019] pid_max: default: 32768 minimum: 301
[    0.003012] ACPI: Core revision 20170119
[    0.004345] ACPI: 1 ACPI AML tables successfully acquired and loaded
[    0.005029] Security Framework initialized
[    0.006002] Yama: becoming mindful.
[    0.006678] SELinux:  Initializing.
[    0.008673] Dentry cache hash table entries: 4194304 (order: 13, 33554432 bytes)
[    0.014337] Inode-cache hash table entries: 2097152 (order: 12, 16777216 bytes)
[    0.017435] Mount-cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.018022] Mountpoint-cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.020276] CPU: Physical Processor ID: 0
[    0.022049] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.024005] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.036697] Freeing SMP alternatives memory: 28K
[    0.039385] smpboot: Max logical packages: 1
[    0.041240] x2apic enabled
[    0.044000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.044000] smpboot: CPU0: Intel Core Processor (Broadwell) (family: 0x6, model: 0x3d, stepping: 0x2)
[    0.044000] Performance Events: unsupported p6 CPU model 61 no PMU driver, software events only.
[    0.044000] smp: Bringing up secondary CPUs ...
[    0.044000] smp: Brought up 1 node, 1 CPU
[    0.044000] smpboot: Total of 1 processors activated (4397.44 BogoMIPS)
[    0.044000] sched_clock: Marking stable (43000000, 0)->(370752526, -327752526)
[    0.062314] devtmpfs: initialized
[    0.063602] x86/mm: Memory block size: 128MB
[    0.069517] NET: Registered protocol family 16
[    0.070934] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[    0.073418] IP: sock_alloc+0xe/0x80
[    0.074593] PGD 0 
[    0.074594] 
[    0.076393] Oops: 0000 [#1] SMP
[    0.077505] Modules linked in:
[    0.078612] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-0.rc7.git0.1.ptlto2.fc26.x86_64 #1
[    0.082872] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.9.3-1.fc25 04/01/2014
[    0.085282] task: ffff95811be18000 task.stack: ffffb7f183124000
[    0.086747] RIP: 0010:sock_alloc+0xe/0x80
[    0.087942] RSP: 0000:ffffb7f183127bd0 EFLAGS: 00010246
[    0.089330] RAX: 0000000000000000 RBX: ffffffffb7d18f20 RCX: 0000000000000001
[    0.090968] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000010
[    0.092613] RBP: ffffb7f183127be0 R08: ffff95811be18000 R09: 000000000000007a
[    0.094244] R10: ffffffffb7c5f660 R11: ffffb7f183127bd0 R12: 0000000000000002
[    0.095855] R13: 0000000000000010 R14: 0000000000000000 R15: ffffffffb7d0b340
[    0.097432] FS:  0000000000000000(0000) GS:ffff95813fc00000(0000) knlGS:0000000000000000
[    0.099599] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.100959] CR2: 0000000000000008 CR3: 00000007dcd1b000 CR4: 00000000003406b0
[    0.102519] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.104051] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    0.105547] Call Trace:
[    0.106411]  sock_create_lite+0x6e/0xe0
[    0.107460]  __netlink_kernel_create+0x57/0x250
[    0.108597]  ? proc_register+0xbb/0x110
[    0.109642]  rtnetlink_net_init+0x48/0x70
[    0.110720]  ? sock_diag_rcv+0x40/0x40
[    0.113457]  ops_init+0x3c/0x110
[    0.114443]  register_pernet_operations+0x10f/0x1d0
[    0.115565]  register_pernet_subsys+0x23/0x40
[    0.127377]  netlink_proto_init+0x152/0x2e0
[    0.128372]  ? fib_rules_init+0xac/0xac
[    0.129331]  ? raid_setup+0x11e/0x11e
[    0.130264]  do_one_initcall+0x102/0x1ce
[    0.131225]  ? proc_alloc_inum+0x2c/0xc0
[    0.132181]  ? proc_register+0xbb/0x110
[    0.133137]  ? parse_args+0x23c/0x3ab
[    0.134071]  ? raid_setup+0x11e/0x11e
[    0.135007]  kernel_init_freeable+0x14a4/0x1836
[    0.136052]  ? rest_init+0xc0/0xc0
[    0.136977]  kernel_init+0x12/0x2b0
[    0.137886]  ? rest_init+0xc0/0xc0
[    0.138806]  ret_from_fork+0x2c/0x40
[    0.139726] Code: ef 30 48 89 e5 e8 83 ff ff ff 31 c0 5d c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 8b 05 20 58 c8 00 48 89 e5 41 54 53 <48> 8b 78 08 e8 b9 59 1c 00 48 85 c0 74 54 48 89 c3 4c 8d 60 d0 
[    0.145157] RIP: sock_alloc+0xe/0x80 RSP: ffffb7f183127bd0
[    0.146328] CR2: 0000000000000008
[    0.147264] ---[ end trace 2a4fbaac2d96e5d0 ]---
[    0.148322] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[    0.148322] 
[    0.150784] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[    0.150784]

With gcc 7 kernel also panics with:

[    0.000000] Linux version 4.11.0-0.rc7.git0.1.ptlto1.fc26.x86_64 (root@localhost.localdomain) (gcc version 7.0.1 20170309 (Red Hat 7.0.1-0.12) (GCC) ) #1 SMP Mon Apr 24 12:23:08 UTC 2017
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.11.0-0.rc7.git0.1.ptlto1.fc26.x86_64 root=UUID=efe62ef9-dcfb-4156-a2ab-42d9bb328759 ro no_timer_check console=tty1 console=ttyS0,115200n8 rhgb LANG=en_US.UTF-8
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007ffddfff] usable
[    0.000000] BIOS-e820: [mem 0x000000007ffde000-0x000000007fffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000b0000000-0x00000000bfffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000087fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.8 present.
[    0.000000] DMI: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.9.3-1.fc25 04/01/2014
[    0.000000] Hypervisor detected: KVM
[    0.000000] e820: last_pfn = 0x880000 max_arch_pfn = 0x400000000
[    0.000000] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WC  UC- WT  
[    0.000000] e820: last_pfn = 0x7ffde max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000f6b90-0x000f6b9f] mapped at [ffff9368400f6b90]
[    0.000000] RAMDISK: [mem 0x360f6000-0x37072fff]
[    0.000000] ACPI: Early table checksum verification disabled
[    0.000000] ACPI: RSDP 0x00000000000F6970 000014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 0x000000007FFE2067 000030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 0x000000007FFE1F3F 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 0x000000007FFE0040 001EFF (v01 BOCHS  BXPCDSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACS 0x000000007FFE0000 000040
[    0.000000] ACPI: APIC 0x000000007FFE1FB3 000078 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: MCFG 0x000000007FFE202B 00003C (v01 BOCHS  BXPCMCFG 00000001 BXPC 00000001)
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000087fffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x87ffb8000-0x87ffe2fff]
[    0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
[    0.000000] kvm-clock: cpu 0, msr 8:7ff38001, primary cpu clock
[    0.000000] kvm-clock: using sched offset of 20058172526 cycles
[    0.000000] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000001000-0x0000000000ffffff]
[    0.000000]   DMA32    [mem 0x0000000001000000-0x00000000ffffffff]
[    0.000000]   Normal   [mem 0x0000000100000000-0x000000087fffffff]
[    0.000000]   Device   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000001000-0x000000000009efff]
[    0.000000]   node   0: [mem 0x0000000000100000-0x000000007ffddfff]
[    0.000000]   node   0: [mem 0x0000000100000000-0x000000087fffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000001000-0x000000087fffffff]
[    0.000000] ACPI: PM-Timer IO Port: 0x608
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] e820: [mem 0xc0000000-0xfed1bfff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on KVM
[    0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[    0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:1 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] percpu: Embedded 34 pages/cpu @ffff9370bfc00000 s101208 r8192 d29864 u2097152
[    0.000000] KVM setup async PF for cpu 0
[    0.000000] kvm-stealtime: cpu 0, msr 87fc12d80
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 8257383
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.11.0-0.rc7.git0.1.ptlto1.fc26.x86_64 root=UUID=efe62ef9-dcfb-4156-a2ab-42d9bb328759 ro no_timer_check console=tty1 console=ttyS0,115200n8 rhgb LANG=en_US.UTF-8
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] Memory: 32929716K/33553904K available (7203K kernel code, 1446K rwdata, 2340K rodata, 1632K init, 1552K bss, 624188K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.001000] Hierarchical RCU implementation.
[    0.001000] 	Build-time adjustment of leaf fanout to 64.
[    0.001000] 	RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=1.
[    0.001000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=1
[    0.001000] NR_IRQS:524544 nr_irqs:256 16
[    0.001000] 	Offload RCU callbacks from all CPUs
[    0.001000] 	Offload RCU callbacks from CPUs: 0.
[    0.001000] Console: colour VGA+ 80x25
[    0.001000] console [tty1] enabled
[    0.001000] console [ttyS0] enabled
[    0.001004] tsc: Detected 2198.724 MHz processor
[    0.001870] Calibrating delay loop (skipped) preset value.. 4397.44 BogoMIPS (lpj=2198724)
[    0.002002] pid_max: default: 32768 minimum: 301
[    0.003011] ACPI: Core revision 20170119
[    0.004458] ACPI: 1 ACPI AML tables successfully acquired and loaded
[    0.005029] Security Framework initialized
[    0.006002] Yama: becoming mindful.
[    0.007005] SELinux:  Initializing.
[    0.009533] Dentry cache hash table entries: 4194304 (order: 13, 33554432 bytes)
[    0.015402] Inode-cache hash table entries: 2097152 (order: 12, 16777216 bytes)
[    0.018692] Mount-cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.019024] Mountpoint-cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.021244] CPU: Physical Processor ID: 0
[    0.023052] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.024002] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.031424] Freeing SMP alternatives memory: 28K
[    0.032482] smpboot: Max logical packages: 1
[    0.033142] x2apic enabled
[    0.035544] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.036000] smpboot: CPU0: Intel Core Processor (Broadwell) (family: 0x6, model: 0x3d, stepping: 0x2)
[    0.036000] Performance Events: unsupported p6 CPU model 61 no PMU driver, software events only.
[    0.036000] smp: Bringing up secondary CPUs ...
[    0.036000] smp: Brought up 1 node, 1 CPU
[    0.036000] smpboot: Total of 1 processors activated (4397.44 BogoMIPS)
[    0.036000] sched_clock: Marking stable (35000000, 0)->(337744997, -302744997)
[    0.044979] devtmpfs: initialized
[    0.045783] x86/mm: Memory block size: 128MB
[    0.049454] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[    0.051008] IP: sysfs_create_mount_point+0x1a/0xa0
[    0.051839] PGD 0 
[    0.051839] 
[    0.054564] Oops: 0000 [#1] SMP
[    0.055297] Modules linked in:
[    0.056024] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-0.rc7.git0.1.ptlto1.fc26.x86_64 #1
[    0.057648] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.9.3-1.fc25 04/01/2014
[    0.059391] task: ffff93709be18000 task.stack: ffff9f9a03124000
[    0.060436] RIP: 0010:sysfs_create_mount_point+0x1a/0xa0
[    0.061447] RSP: 0000:ffff9f9a03127d40 EFLAGS: 00010282
[    0.062492] RAX: ffffffff99cd1600 RBX: ffffffff99d8957b RCX: 0000000000000001
[    0.063601] RDX: 000000000000416d RSI: ffffffff99955bf6 RDI: 0000000000000000
[    0.064735] RBP: ffff9f9a03127d60 R08: ffff9370bff356ef R09: ffff9370bff356ea
[    0.065782] R10: 0000000000000038 R11: 000000000001bf01 R12: ffffffff99eefdc8
[    0.066920] R13: ffffffff99955bf6 R14: 0000000000000002 R15: ffffffff99dcf148
[    0.068019] FS:  0000000000000000(0000) GS:ffff9370bfc00000(0000) knlGS:0000000000000000
[    0.069563] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.070618] CR2: 0000000000000030 CR3: 000000012fd1b000 CR4: 00000000003406b0
[    0.071733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.072808] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    0.073866] Call Trace:
[    0.074572]  ? tracefs_init+0x3b/0x3b
[    0.075309]  debugfs_init+0x18/0x50
[    0.076068]  do_one_initcall+0x118/0x1f2
[    0.076871]  ? proc_alloc_inum+0x3b/0xd0
[    0.077666]  ? proc_register+0xbb/0x110
[    0.078540]  ? parse_args+0x26c/0x349
[    0.079323]  kernel_init_freeable+0x1513/0x187f
[    0.080199]  ? rest_init+0xc0/0xc0
[    0.080929]  kernel_init+0x21/0x2e0
[    0.081702]  ? rest_init+0xc0/0xc0
[    0.082551]  ret_from_fork+0x2c/0x40
[    0.084770] Code: 08 5b 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 b9 01 00 00 00 ba 6d 41 00 00 48 89 e5 41 55 49 89 f5 41 54 53 48 83 ec 08 <4c> 8b 67 30 4c 89 e7 e8 8a ff ff ff 48 89 c3 b8 f4 ff ff ff 48 
[    0.087962] RIP: sysfs_create_mount_point+0x1a/0xa0 RSP: ffff9f9a03127d40
[    0.089025] CR2: 0000000000000030
[    0.089802] ---[ end trace cc45c0da12334c50 ]---
[    0.090713] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[    0.090713] 
[    0.092921] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[    0.092921]

Thanks,
Gleb

[andikleen]

On Mon, Apr 24, 2017 at 07:54:33AM -0700, Gleb Schukin wrote: Hi Andi, I observe the following panic on uni-processor VM, with binutils 2.27 and gcc 6.3.1:

Same. Does it work with -fno-toplevel-reorder ?

…

-Andi

[gschukin]

-fno-toplevel-reorder helps, so I'm closing the issue

[andikleen]

Can you please attach the configs.

I still need to fix it.

[gschukin]

It was the same as in #21

[andikleen]

Sorry for the delay. It should be fixed now. I also created a new cleaner lto-411-2 branch

Any additional testing welcome

[majin2020]

@andikleen @gschukin
hi, I have just started to learn the kernel. I am very interested in the LTO kernel, and have tested the clang LTO kernel of Sami. The results show that there is almost no benefit, especially in terms of volume.

So I turned to Andi's GCC LTO kernel test, but after several weeks I still failed to run successfully, which was very painful for me. The compiler and the LTO kernel have tried different versions. The compiled systems include Ubuntu 16, Ubuntu 18 and CentOS, and the platforms include virtual machines and physical machines. Unfortunately, I have not succeeded.

Can you tell me the specific environment in which you run successfully? It would be perfect to provide a compilation process.

Thanks,
jinma