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Making sure allocation failures are handled locally (i.e. don't forget to recover) #204

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Ericson2314 opened this issue Apr 17, 2021 · 1 comment
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Making sure allocation failures are handled locally (i.e. don't forget to recover) #204

Ericson2314 opened this issue Apr 17, 2021 · 1 comment
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• lib Related to the `rust/` library.

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@Ericson2314
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i have opened rust-lang/wg-allocators#87 and rust-lang/rust#84266 about this. Should be easy to pass the appropriate flags to rustc to disable that feature if the PR or something like it lands.
@ojeda ojeda added prio: high • lib Related to the `rust/` library. labels Apr 17, 2021
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ojeda commented Apr 17, 2021

This should probably go into #199.

@ojeda ojeda closed this as completed Apr 19, 2021
@ojeda ojeda mentioned this issue Apr 19, 2021
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ojeda pushed a commit that referenced this issue Jan 10, 2022
@nikunjad @bonzini
KVM: x86: Check for rmaps allocation
fffb532 
With TDP MMU being the default now, access to mmu_rmaps_stat debugfs
file causes following oops:

BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 7 PID: 3185 Comm: cat Not tainted 5.16.0-rc4+ #204
RIP: 0010:pte_list_count+0x6/0x40
 Call Trace:
  <TASK>
  ? kvm_mmu_rmaps_stat_show+0x15e/0x320
  seq_read_iter+0x126/0x4b0
  ? aa_file_perm+0x124/0x490
  seq_read+0xf5/0x140
  full_proxy_read+0x5c/0x80
  vfs_read+0x9f/0x1a0
  ksys_read+0x67/0xe0
  __x64_sys_read+0x19/0x20
  do_syscall_64+0x3b/0xc0
  entry_SYSCALL_64_after_hwframe+0x44/0xae
 RIP: 0033:0x7fca6fc13912

Return early when rmaps are not present.

Reported-by: Vasant Hegde <vasant.hegde@amd.com>
Tested-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220105040337.4234-1-nikunj@amd.com>
Cc: stable@vger.kernel.org
Fixes: 3bcd066 ("KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ojeda @Ericson2314