From: Peter Steiner <sp@med-2-med.com>
To: viro@zeniv.linux.org.uk
Cc: sarah.a.sharp@linux.intel.com, linux-mm@kvack.org, axboe@kernel.dk
Subject: Re: 2.6.36.2 reliably panics in VFS
Date: Mon, 13 Dec 2010 18:24:43 +0100 [thread overview]
Message-ID: <20101213172416.1F7256FD9C@nx.neverkill.us> (raw)
In-Reply-To: <1292153208.4213.8.camel@hp>
Just paste for you the asm here from 2.6.36.2:
ffffffff81038220 <task_rq_lock>:
ffffffff81038220: 48 83 ec 28 sub $0x28,%rsp
ffffffff81038224: 48 89 5c 24 08 mov %rbx,0x8(%rsp)
ffffffff81038229: 48 89 6c 24 10 mov %rbp,0x10(%rsp)
ffffffff8103822e: 4c 89 64 24 18 mov %r12,0x18(%rsp)
ffffffff81038233: 48 c7 c3 80 24 01 00 mov $0x12480,%rbx
ffffffff8103823a: 4c 89 6c 24 20 mov %r13,0x20(%rsp)
ffffffff8103823f: 48 89 fd mov %rdi,%rbp
ffffffff81038242: 49 89 f4 mov %rsi,%r12
ffffffff81038245: ff 14 25 e0 0d 57 81 callq
*0xffffffff81570de0
ffffffff8103824c: 48 89 c2 mov %rax,%rdx
ffffffff8103824f: ff 14 25 f0 0d 57 81 callq
*0xffffffff81570df0
ffffffff81038256: 49 89 14 24 mov %rdx,(%r12)
ffffffff8103825a: 49 89 dd mov %rbx,%r13
ffffffff8103825d: 48 8b 45 08 mov 0x8(%rbp),%rax
ffffffff81038261: 8b 40 18 mov 0x18(%rax),%eax
ffffffff81038264: 4c 03 2c c5 a0 26 5c add -0x7ea3d960(,%
rax,8),%r13 <============ PANICS
ffffffff8103826b: 81
ffffffff8103826c: 4c 89 ef mov %r13,%rdi
ffffffff8103826f: e8 2c ff 3c 00 callq ffffffff814081a0
<_raw_spin_lock>
ffffffff81038274: 48 8b 45 08 mov 0x8(%rbp),%rax
ffffffff81038278: 8b 40 18 mov 0x18(%rax),%eax
ffffffff8103827b: 48 8b 04 c5 a0 26 5c mov -0x7ea3d960(,%
rax,8),%rax
ffffffff81038282: 81
ffffffff81038283: 48 8d 04 03 lea (%rbx,%rax,1),%
rax
ffffffff81038287: 49 39 c5 cmp %rax,%r13
ffffffff8103828a: 75 1c jne ffffffff810382a8
<task_rq_lock+0x88>
ffffffff8103828c: 4c 89 e8 mov %r13,%rax
ffffffff8103828f: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx
ffffffff81038294: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp
ffffffff81038299: 4c 8b 64 24 18 mov 0x18(%rsp),%r12
ffffffff8103829e: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13
ffffffff810382a3: 48 83 c4 28 add $0x28,%rsp
ffffffff810382a7: c3 retq
ffffffff810382a8: 49 8b 34 24 mov (%r12),%rsi
ffffffff810382ac: 4c 89 ef mov %r13,%rdi
ffffffff810382af: e8 9c 03 3d 00 callq ffffffff81408650
<_raw_spin_unlock_irqrestore>
ffffffff810382b4: eb 8f jmp ffffffff81038245
<task_rq_lock+0x25>
ffffffff810382b6: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%
rax,1)
ffffffff810382bd: 00 00 00
looks like a bogus value in RAX, then page fault in kernel space =>
panics.
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next parent reply other threads:[~2010-12-13 17:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1292153208.4213.8.camel@hp>
2010-12-13 17:24 ` Peter Steiner [this message]
[not found] <20101212113004.94FA96FD97@nx.neverkill.us>
2010-12-13 16:49 ` 2.6.36.2 reliably panics in VFS Sarah Sharp
[not found] ` <20101213170003.D35666FD97@nx.neverkill.us>
2010-12-13 17:16 ` Peter Steiner
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