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    SubjectRe: 2.5.63 BUG in deadline-iosched.c
    Andrew Morton wrote:

    > Janet Morgan <janetmor@us.ibm.com> wrote:
    > >
    > > I got this on 2.5.63 while running the "find" command:
    > >
    > > kernel BUG at drivers/block/deadline-iosched.c:145!
    > > invalid operand: 0000
    > > CPU: 3
    > > EIP: 0060:[<c026f8a1>] Not tainted
    > > EFLAGS: 00010046
    > > EIP is at deadline_find_drq_hash+0x41/0xb0
    > > eax: f76fe060 ebx: f76fe058 ecx: f76fe060 edx: 00000000
    > > esi: f76fe060 edi: f76fe044 ebp: f76fe050 esp: f7e27c88
    > > ds: 007b es: 007b ss: 0068
    > > Process pdflush (pid: 16, threadinfo=f7e26000 task=c3b39300)
    > > Stack: 010d7ce6 00000000 f7fd2ae0 f7fd2ae0 f7fd2ae0 f7747f80 c026fbc9
    > > f7747f80
    > > 010d7ce6 00000000 f7747f80 00000000 f7759000 f7759000 00000008
    > > c026a438
    > > f7759000 f7e27cf8 f7fd2ae0 c026cc58 f7759000 f7e27cf8 f7fd2ae0
    > > 010d7ce6
    > > Call Trace:
    > > [<c026fbc9>] deadline_merge+0x49/0x120
    > > [<c026a438>] elv_merge+0x18/0x30
    > > [<c026cc58>] __make_request+0xb8/0x440
    >
    > Nick, could this be caused by a stale next_drq[] entry?
    >
    > If so,
    >
    > http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.63/2.5.63-mm1/broken-out/deadline-dispatching-fix.patch
    >
    > is designed to fix it.

    Thanks Andrew. 2.5.63-mm1 fixes the problem.

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