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    SubjectRe: Reproducable OOPS with MD RAID-5 on 2.6.0-test11
    On Mon, Dec 01 2003, Kevin P. Fleming wrote:
    > I've got a new system here with six SATA disks set up in a RAID-5 array
    > (no partition tables, using the whole disks). I then used LVM2 tools to
    > make the RAID array a physical volume, created a logical volume and
    > formatted that volume with an XFS filesystem.
    >
    > Mounting the filesystem and copying over the 2.6 kernel source tree
    > produces this OOPS (and is pretty reproducable):
    >
    > kernel BUG at fs/bio.c:177!

    It's doing a put on an already freed bio, that's really bad.

    > invalid operand: 0000 [#1]
    > CPU: 0
    > EIP: 0060:[<c014db9a>] Not tainted
    > EFLAGS: 00010246
    > EIP is at bio_put+0x2c/0x36
    > eax: 00000000 ebx: f6221080 ecx: c1182180 edx: edcbf780
    > esi: c577b998 edi: 00000002 ebp: edcbf780 esp: f78ffeb0
    > ds: 007b es: 007b ss: 0068
    > Process md0_raid5 (pid: 65, threadinfo=f78fe000 task=f7924080)
    > Stack: c71e2640 c021d88d edcbf780 00000000 00000001 c1182180 00000009
    > 0001000
    > edcbf780 00000000 00000000 00000000 c014e2fc edcbf780 00000000
    > 00000000
    > f23a0ff0 f23a0ff0 edcbf7c0 c02ca51d edcbf780 00000000 00000000
    > 00000000
    > Call Trace:
    > [<c021d88d>] bio_end_io_pagebuf+0x9a/0x138
    > [<c014e2fc>] bio_endio+0x59/0x7e
    > [<c02ca51d>] clone_endio+0x82/0xb5
    > [<c02c0dc3>] handle_stripe+0x8f2/0xec0
    > [<c02c17d1>] raid5d+0x71/0x105
    > [<c02c898c>] md_thread+0xde/0x15c
    > [<c011984b>] default_wake_function+0x0/0x12
    > [<c02c88ae>] md_thread+0x0/0x15c
    > [<c0107049>] kernel_thread_helper+0x5/0xb

    Odds are it's a raid5 bug.

    > Hardware is a 2.6CGHz P4, 1G of RAM (4G highmem enabled), SMP kernel but
    > no preemption. Kernel config is at:

    Are you using ide or libata as the backing for the sata drives?

    --
    Jens Axboe

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