Re: Kernel 2.6.19.2 New RAID 5 Bug (oops when writing Samba -> RAID5)

[Chuck Ebbert <cebbert@redhat.com>]

Justin Piszcz wrote:
> My .config is attached, please let me know if any other information is 
> needed and please CC (lkml) as I am not on the list, thanks!
>
> Running Kernel 2.6.19.2 on a MD RAID5 volume.  Copying files over Samba to 
> the RAID5 running XFS.
>
> Any idea what happened here?
>
> [473795.214705] BUG: unable to handle kernel paging request at virtual 
> address fffb92b0
> [473795.214715]  printing eip:
> [473795.214718] c0358b14
> [473795.214721] *pde = 00003067
> [473795.214723] *pte = 00000000
> [473795.214726] Oops: 0000 [#1]
> [473795.214729] PREEMPT SMP 
> [473795.214736] CPU:    0
> [473795.214737] EIP:    0060:[<c0358b14>]    Not tainted VLI
> [473795.214738] EFLAGS: 00010286   (2.6.19.2 #1)
> [473795.214746] EIP is at copy_data+0x6c/0x179
> [473795.214750] eax: 00000000   ebx: 00001000   ecx: 00000354   edx: fffb9000
> [473795.214754] esi: fffb92b0   edi: da86c2b0   ebp: 00001000   esp: f7927dc4
> [473795.214757] ds: 007b   es: 007b   ss: 0068
> [473795.214761] Process md4_raid5 (pid: 1305, ti=f7926000 task=f7ea9030 task.ti=f7926000)
> [473795.214765] Stack: c1ba7c40 00000003 f5538c80 00000001 da86c000 00000009 00000000 0000006c 
> [473795.214790]        00001000 da8536a8 aa6fee90 f5538c80 00000190 c0358d00 aa6fee88 0000ffff 
> [473795.214863]        d7c5794c 00000001 da853488 f6fbec70 f6fbebc0 00000001 00000005 00000001 
> [473795.214876] Call Trace:
> [473795.214880]  [<c0358d00>] compute_parity5+0xdf/0x497
> [473795.214887]  [<c035b0dd>] handle_stripe+0x930/0x2986
> [473795.214892]  [<c01146b9>] find_busiest_group+0x124/0x4fd
> [473795.214898]  [<c03580e0>] release_stripe+0x21/0x2e
> [473795.214902]  [<c035d233>] raid5d+0x100/0x161
> [473795.214907]  [<c036b03c>] md_thread+0x40/0x103
> [473795.214912]  [<c012dbbe>] autoremove_wake_function+0x0/0x4b
> [473795.214917]  [<c036affc>] md_thread+0x0/0x103
> [473795.214922]  [<c012da1a>] kthread+0xfc/0x100
> [473795.214926]  [<c012d91e>] kthread+0x0/0x100
> [473795.214930]  [<c0103b4b>] kernel_thread_helper+0x7/0x1c
> [473795.214935]  =======================
> [473795.214938] Code: 14 39 d1 0f 8d 10 01 00 00 89 c8 01 c0 01 c8 01 c0 
> 01 c0 89 44 24 1c eb 51 89 d9 c1 e9 02 8b 7c 24 10 01 f7 8b 44 24 18 8d 34 
> 02 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 c7 44 24 04 03 00 00 00 89 14 
> [473795.215017] EIP: [<c0358b14>] copy_data+0x6c/0x179 SS:ESP 
> 0068:f7927dc4
>   
Without digging too deeply, I'd say you've hit the same bug Sami Farin 
and others
have reported starting with 2.6.19: pages mapped with kmap_atomic() 
become unmapped
during memcpy() or similar operations.  Try disabling preempt -- that 
seems to be the
common factor.


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