Re: Kernel OOOPS in 2.6.11.6

[Chris Wright <chrisw@osdl.org>]

* Ali Akcaagac (aliakc@web.de) wrote:
> And happy easter to you all. Just got this while trying to delete some
> files on my system.

I'm curious, what was the virtual address the kernel was "Unable to handle..."
That part was left off this bug report.

> :  printing eip:
> : c021f089
> : *pde = 00000000
> : Oops: 0000 [#1]
> : PREEMPT 
> : Modules linked in: snd_seq_midi snd_emu10k1_synth snd_emux_synth
> snd_seq_virmidi snd_seq_midi_event snd_seq_midi_emul snd_seq snd_emu10k1
> snd_rawmidi snd_seq_device snd_ac97_codec snd_pcm snd_timer
> snd_page_alloc snd_util_mem snd_hwdep snd soundcore parport_pc lp
> parport 8139too mii crc32
> : CPU:    0
> : EIP:    0060:[linvfs_open+89/160]    Not tainted VLI
> : EFLAGS: 00010282   (2.6.11.6) 
> : EIP is at linvfs_open+0x59/0xa0

Nothing in the -stable series has changed either XFS or the core vfs
path on during file open.  Without a chance of reproducing or any more
information, it'll be tough to make much progress here.

> : eax: 00000000   ebx: c77ac06c   ecx: 00000001   edx: c021f030
> : esi: 00000000   edi: c77ac050   ebp: dffe41a0   esp: c2d95f14
> : ds: 007b   es: 007b   ss: 0068
> : Process mc (pid: 17862, threadinfo=c2d94000 task=d18d2a80)
> : Stack: c01561a9 dffe41a0 d73504c0 00000000 c77ac06c c015446b c77ac06c
> d73504c0 
> :        00000001 ffffffe9 00008000 00008000 dc364000 c2d94000 c015426c
> cbcdff54 
> :        dffe41a0 00008000 c2d95f60 cbcdff54 dffe41a0 bfffeef0 0d00ad72
> 00300001 
> : Call Trace:
> :  [get_empty_filp+89/208] get_empty_filp+0x59/0xd0
> :  [dentry_open+491/672] dentry_open+0x1eb/0x2a0
> :  [filp_open+92/112] filp_open+0x5c/0x70
> :  [get_unused_fd+123/224] get_unused_fd+0x7b/0xe0
> :  [sys_open+73/144] sys_open+0x49/0x90
> :  [syscall_call+7/11] syscall_call+0x7/0xb
> : Code: 5b 3c b8 01 00 00 00 e8 c6 42 ef ff b8 00 e0 ff ff 21 e0 8b 40
> 08 a8 08 75 4d 85 f6 7c 0a 7f 32 81 fb ff ff ff 7f 77 2a 8b 47 14 <8b>
> 50 08 c7 44 24 04 00 00 00 00 89 04 24 ff 52 04 8b 5c 24 08 

Best I can tell, you hit this:

 mov    0x8(%eax),%edx

with eax == 00000000.  This corresponds to a vp->v_fops (or rather
vp->v_bh.bh_first->bd_ops) deref.  So, looks like the vnode has a
NULL v_bh.bh_first (which looks like it's meant to be used to mean
uninitialized).  May check with XFS folks if they've seen this type
of bug.

thanks,
-chris
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