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    SubjectRe: [OOPS] 2.6.21-rc6-git5 in cfq_dispatch_insert
    Hi Jens!

    On 25 Apr 2007, at 12:18, Jens Axboe wrote:

    > On Wed, Apr 25 2007, Brad Campbell wrote:
    >> Jens Axboe wrote:
    >>> It looks to be extremely rare. Aliases are extremely rare, front
    >>> merges
    >>> are rare. And you need both to happen with the details you
    >>> outlined. But
    >>> it's a large user base, and we've had 3-4 reports on this in the
    >>> past
    >>> months. So it obviously does happen. I could not make it trigger
    >>> without
    >>> doctoring the unplug code when I used aio.
    >> Well, not that rare on this particular machine (I had a case where
    >> I could
    >> reproduce it in less than an hour of normal use previously on this
    >> box),
    >> and I've had it occur a number of times on my servers, I just never
    >> reported it before as I never took the time to set up a serial
    >> console and
    >> capture the oops.
    > Extremely rare in the sense that it takes md and some certain
    > conditions
    > to happen for it to trigger. So for most people it'll be extremely
    > rare,
    > and for others (such as yourself) that hit it, it wont be so rare :-)
    >>> Here's a fix for it, confirmed.
    >> Shall I leave the other debugging in, apply this and run it for a
    >> few hard
    >> days?
    > Yes, that would be perfect!
    Okay, I left all debugging patches in, disabled all kernel
    debugging .config stuff and gave it a spin with our usual "killer"
    workload (as far as batch systems are repeatable anyway) and so far
    there was not a single glitch or message, so I preliminarily conclude
    that the bug is squashed. The final word will come once my 1800 batch
    jobs are processed and I have my particle physics result ;-)


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