From: "Girish Shilamkar" <girish@clusterfs.com>
Subject: Re: jbd2_journal_commit_transaction oops
Date: Thu, 13 Sep 2007 15:19:46 +0530
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Cc: "Avantika Mathur" <mathur@linux.vnet.ibm.com>
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Hi,
              Avantika and I had been working on this and we found
that this problem is only seen on numaq machines. Avantika plans to
run few more tests on numaq machines to gather more information.

Regards,
Girish.

On 9/1/07, Avantika Mathur <mathur@linux.vnet.ibm.com> wrote:
> Girish Shilamkar wrote:
> > Hi Avantika,
> >       From initial code review I think oops in crc32_be is caused as
> > bh->b_data passed to the function is NULL. Most probably something might
> > have gone wrong in jbd2_journal_write_metadata_buffer() making bh->data
> > = 0.
> > Does the error go away, when run without journal_checksum patch/option ?
> >
> >
> >
> I tried running fsstress without the journal_checksum option set and
> didn't see any errors.  But I got the oops again when I mounted with
> journal_checksum.
> thank you for looking into this.
>
> Avantika
> > On Thu, 2007-08-30 at 11:16 -0700, Avantika Mathur wrote:
> >
> >> Hi Girish,
> >>
> >> When running fsstress on an x86 machine, I hit the kernel oops below.  The ext4-patch-queue is being tested including the journal checksum patches
> >> I have mounted with -o delalloc,mballoc,data=writeback,journal_checksum
> >>
> >> I did not get a chance to look in detail; but it looks like a journal issue.  Do you know what the issue might be?
> >>
> >>
> >> BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
> >>  printing eip:
> >> c118ba5d
> >> *pdpt = 000000002560a001
> >> *pde = 0000000000000000
> >> Oops: 0000 [#1]
> >> SMP
> >> Modules linked in:
> >> CPU:    1
> >> EIP:    0060:[<c118ba5d>]    Not tainted VLI
> >> EFLAGS: 00010257   (2.6.23-rc4-autokern1 #1)
> >> EIP is at crc32_be+0x3d/0x9c
> >> eax: 7e78a276   ebx: 76a2787e   ecx: 00000400   edx: 00000000
> >> esi: 00000000   edi: 00000000   ebp: f56e5200   esp: e61f9e90
> >> ds: 007b   es: 007b   fs: 00d8  gs: 0000  ss: 0068
> >> Process kjournald2 (pid: 5388, ti=e61f8000 task=e3efc000 task.ti=e61f8000)
> >> Stack: ef5fffc0 00000016 c10c762d 0000055e 00000000 00000000 00001000 00000000
> >>        f50e3e80 7e78a276 00000008 00000000 00000544 eb46aab4 eb46aabc 00000155
> >>        f585f800 e1e1c968 00000000 eb059428 0000055e 00000000 00000000 e3efc000
> >> Call Trace:
> >>  [<c10c762d>] jbd2_journal_commit_transaction+0x92a/0x128d
> >>  [<c1029e51>] autoremove_wake_function+0x0/0x33
> >>  [<c1029e51>] autoremove_wake_function+0x0/0x33
> >>  [<c10214f4>] try_to_del_timer_sync+0x42/0x48
> >>  [<c10ca4fd>] kjournald2+0x130/0x307
> >>  [<c1029e51>] autoremove_wake_function+0x0/0x33
> >>  [<c129171c>] __sched_text_start+0x364/0x3ff
> >>  [<c1029e51>] autoremove_wake_function+0x0/0x33
> >>  [<c10ca3cd>] kjournald2+0x0/0x307
> >>  [<c1029a27>] kthread+0x34/0x55
> >>  [<c10299f3>] kthread+0x0/0x55
> >>  [<c1003173>] kernel_thread_helper+0x7/0x10
> >>  =======================
> >> Code: 42 30 d8 0f b6 c0 c1 eb 08 33 1c 85 e0 ae 2a c1 49 74 05 f6 c2 03 75 e5 83 f9 03 76 4c 89 ce 83 ea 04 83 e6 03 c1 e9 02 83 c2 04 <33> 1a 0f b6 c3 c1 eb 08 33 1c 85 e0 ae 2a c1 0f b6 c3 c1 eb 08
> >> EIP: [<c118ba5d>] crc32_be+0x3d/0x9c SS:ESP 0068:e61f9e90
> >> -- 0:conmux-control -- time-stamp -- Aug/30/07  0:36:46 --
> >> -- 0:conmux-control -- time-stamp -- Aug/30/07  5:56:32 --
> >> (bot:conmon-payload) disconnected
> >>
> >>
> >> thanks,
> >> Avantika
> >>
> >
> > -
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