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SubjectRe: Oops: Quota race in 2.4.12?
  Hello,

> Some of our dual CPU web servers with 2.4.12 are Oopsing while running
> quotacheck. They don't seem to die immediately, but oops many times and
> eventually break. The old tools didn't warn about quotachecking on a
> live file system, so some of our servers were set up to run quotacheck
> nightly. The new tools still allow you to do it, but warn that it may
> not be consistent. We didn't have any problems with 2.2 kernels.
>
> First oops, as already processed (grumble) by klogd:
>
> Oct 28 04:22:32 pro kernel: remove_free_dquot: dquot not on the free list??
> Oct 28 04:22:32 pro last message repeated 90 times
> Oct 28 04:22:32 pro kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000004
> ...dates stripped:
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000004
> printing eip:
> c0149edc
> *pde = 00000000
> Oops: 0002
> CPU: 1
> EIP: 0010:[dqput+148/188] Not tainted
> EFLAGS: 00010246
> eax: d58c8830 ebx: cf330cc0 ecx: cf330cd0 edx: 00000000
> esi: cf330cc0 edi: d2847f6c ebp: 00000000 esp: d2847f30
> ds: 0018 es: 0018 ss: 0018
> Process quotacheck (pid: 3933, stackpage=d2847000)
> Stack: 00000000 c014a93e cf330cc0 00006000 c1a58800 00000000 d2847fa4 00000000
> 00000000 00000000 00000000 00000000 00000000 00000000 00000000 c014b8f0
> c1a58800 0000f465 00000000 00000004 bffffd54 d2846000 bffffd54 001e8ca0
> Call Trace: [set_dqblk+390/404] [sys_quotactl+780/892] [sys_read+188/196] [system_call+51/56]
>
> Code: 89 4a 04 89 53 10 89 41 04 89 08 ff 05 e4 ab 34 c0 8d 43 24
>
> Perhaps there is some obviously broken locking/code in the quotactl syscall?
I'd also blame some SMP locking (I think that on UP everything was tested well) but
everything should be protected by lock_kernel() and it seems to me that everything really
is protected. Anyway I'll try to find the problem.

Thanks for report
Honza

--
Jan Kara <jack@suse.cz>
SuSE CR Labs
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