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SubjectRe: libata badness
On Monday October 4, wknop@andrew.cmu.edu wrote:
> CPU: 0
> EIP: 0060:[<229e4d8c>] Not tainted
> EFLAGS: 00010206 (2.6.8-1.521)
> EIP is at handle_stripe+0x29a/0x1407 [raid5]
> eax: 00000001 ebx: 00000000 ecx: 00915cb8 edx: 21f7e1c0
> esi: 1ccbd118 edi: 21f7e1c0 ebp: 01000000 esp: 1d300f28
> ds: 007b es: 007b ss: 0068
> Process md0_raid5 (pid: 2626, threadinfo=1d300000 task=1d317970)
> Stack: 2283eb57 20db8000 21f7e1c0 21c30288 1ccbd204 20db8000 00000001
> 1ccbd158
> 00000002 00000000 00000000 00000001 00000000 00000000 00000001
> 00000000
> 00000001 00000001 00000000 00000003 1ccbd0ac 21f7e1c0 1ccbd0ac
> 21f76c00
> Call Trace:
> [<2283eb57>] ata_scsi_queuecmd+0xbe/0xc7 [libata]
> [<229e6b1c>] raid5d+0x1ce/0x2f8 [raid5]
> [<0228f5d2>] md_thread+0x227/0x256
> [<0211be05>] autoremove_wake_function+0x0/0x2d
> [<0211be05>] autoremove_wake_function+0x0/0x2d
> [<0228f3ab>] md_thread+0x0/0x256
> [<021041d9>] kernel_thread_helper+0x5/0xb
> Code: 8b 55 04 83 c1 08 8b 45 00 83 d3 00 39 da 72 0e 0f 87 e0 01

This code starts:

0: 8b 55 04 mov 0x4(%ebp),%edx
3: 83 c1 08 add $0x8,%ecx

and as %ebp is 01000000, this oopses.
It looks very much like a single-bit memory error (as has already been
suggested as a possibility).
NeilBrown
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