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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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