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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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