Re: [vserver] opteron server dies with vserver patch.

From: Paweł Sikora <pluto_at_pld-linux.org>
Date: Mon 08 Aug 2011 - 18:36:50 BST
Message-Id: <201108081936.50455.pluto@pld-linux.org>

On Monday 08 of August 2011 19:26:17 Paweł Sikora wrote:
> On Monday 08 of August 2011 18:35:25 Paweł Sikora wrote:
> > On Monday 08 of August 2011 17:57:05 Herbert Poetzl wrote:
> > > On Mon, Aug 08, 2011 at 05:32:21PM +0200, Pawel Sikora wrote:
> > > > On Monday 08 of August 2011 16:28:20 Herbert Poetzl wrote:
> > >
> > > >> ah, I forgot, yes there is a way (not the easiest though)
> > > >> to decode the output your ipmi console recorded:
> > >
> > > >> - extract the byte sequence listed as Code:
> > > >> - search for that sequence in your vmlinux
> > > >> - add the offset of <xx> relative to the first byte (44)
> > > >> - lookup the resulting address with addr2line or
> > > >> compare it with objdump -t vmlinux
> > >
> > > > i've copied v3.0+vserver vmlinuz + more stack traces to web site:
> > >
> > > > http://pluto.agmk.net/kernel/vmlinuz-3.0.0-vs2.3.1-pre8-dirty
> > > > http://pluto.agmk.net/kernel/vserver-crash.jpg
> > >
> > > good idea, but could you also upload the vmlinux (x not z)
> > > from your build tree?
> >
> > bzipped vmlinux uploaded: http://pluto.agmk.net/kernel/vmlinux.bz2
> >
>
> update, screenshot with backtraces is for 2.6.39.y+vserver, correct vmlinux uploaded.
>
> i've isolated so far two code points from screenshot:
>
> trace 1, 3, 5:
>
> ffffffff81165a19: 90 nop
> ffffffff81165a1a: 90 nop
> ffffffff81165a1b: 90 nop
> ffffffff81165a1c: 90 nop
> ffffffff81165a1d: 90 nop
> ffffffff81165a1e: 90 nop
> ffffffff81165a1f: 90 nop
>
> ffffffff81165a20 <vfsmount_lock_local_lock>:
> ffffffff81165a20: 55 push %rbp
> ffffffff81165a21: 48 c7 c0 f0 ee 00 00 mov $0xeef0,%rax
> ffffffff81165a28: 48 89 e5 mov %rsp,%rbp
> ffffffff81165a2b: 65 48 03 04 25 30 c5 add %gs:0xc530,%rax
> ffffffff81165a32: 00 00
> ffffffff81165a34: ba 00 01 00 00 mov $0x100,%edx
> ffffffff81165a39: f0 66 0f c1 10 lock xadd %dx,(%rax)
> ffffffff81165a3e: 38 f2 cmp %dh,%dl
> ffffffff81165a40: 74 06 je ffffffff81165a48 <vfsmount_lock_local_lock+0x28>
> ffffffff81165a42: f3 90 pause
> ffffffff81165a44: 8a 10 mov (%rax),%dl
> ffffffff81165a46: eb f6 jmp ffffffff81165a3e <vfsmount_lock_local_lock+0x1e>
> ffffffff81165a48: c9 leaveq
> ffffffff81165a49: c3 retq
>
> trace 4:
>
> ffffffff81161310 <d_lookup>:
> ffffffff81161310: 55 push %rbp
> ffffffff81161311: 48 89 e5 mov %rsp,%rbp
> ffffffff81161314: 48 83 ec 20 sub $0x20,%rsp
> ffffffff81161318: 4c 89 65 f0 mov %r12,-0x10(%rbp)
> ffffffff8116131c: 4c 89 6d f8 mov %r13,-0x8(%rbp)
> ffffffff81161320: 49 89 f4 mov %rsi,%r12
> ffffffff81161323: 48 89 5d e8 mov %rbx,-0x18(%rbp)
> ffffffff81161327: 49 89 fd mov %rdi,%r13
> ffffffff8116132a: 8b 1d 50 0f 6a 00 mov 0x6a0f50(%rip),%ebx # ffffffff81802280 <rename_lock>
> ffffffff81161330: f6 c3 01 test $0x1,%bl
> ffffffff81161333: 75 26 jne ffffffff8116135b <d_lookup+0x4b>
> ffffffff81161335: 4c 89 e6 mov %r12,%rsi
> ffffffff81161338: 4c 89 ef mov %r13,%rdi
> ffffffff8116133b: e8 d0 fd ff ff callq ffffffff81161110 <__d_lookup>
> ffffffff81161340: 48 85 c0 test %rax,%rax
> ffffffff81161343: 75 08 jne ffffffff8116134d <d_lookup+0x3d>
> ffffffff81161345: 3b 1d 35 0f 6a 00 cmp 0x6a0f35(%rip),%ebx # ffffffff81802280 <rename_lock>
> ffffffff8116134b: 75 dd jne ffffffff8116132a <d_lookup+0x1a>
> ffffffff8116134d: 48 8b 5d e8 mov -0x18(%rbp),%rbx
> ffffffff81161351: 4c 8b 65 f0 mov -0x10(%rbp),%r12
> ffffffff81161355: 4c 8b 6d f8 mov -0x8(%rbp),%r13
> ffffffff81161359: c9 leaveq
> ffffffff8116135a: c3 retq
>
> trace 2:
>
> in progress....
>

possible points:

ffffffff8115f740 <__d_find_any_alias>:
(...)
ffffffff8115f81e: 45 31 c0 xor %r8d,%r8d
ffffffff8115f821: 83 ce ff or $0xffffffff,%esi
ffffffff8115f824: eb c0 jmp ffffffff8115f7e6 <__d_find_any_alias+0xa6>
ffffffff8115f826: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)

ffffffff81161110 <__d_lookup>:
(...)
ffffffff811612fe: 45 31 c0 xor %r8d,%r8d
ffffffff81161301: 83 ce ff or $0xffffffff,%esi
ffffffff81161304: eb c0 jmp ffffffff811612c6 <__d_lookup+0x1b6>
ffffffff81161306: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
Received on Mon Aug 8 18:37:16 2011

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