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    SubjectRe: Processes stuck on D state on Dual Opteron
    Claudio Martins wrote:
    > On Sunday 10 April 2005 03:47, Andrew Morton wrote:
    >
    >>Suggest you boot with `nmi_watchdog=0' to prevent the nmi watchdog from
    >>cutting in during long sysrq traces.
    >>
    >>Also, capture the `sysrq-m' output so we can see if the thing is out of
    >>memory.
    >
    >
    > Hi Andrew,
    >
    > Thanks for the tip. I booted with nmi_watchdog=0 and was able to get a full
    > sysrq-t as well as a sysrq-m. Since it might be a little too big for the
    > list, I've put it on a text file at:
    >
    > http://193.136.132.235/dl145/dump1-2.6.12-rc2.txt
    >

    OK, you _may_ be out of memory here (depending on what the lower zone
    protection for DMA ends up as), however you are well above all the
    "emergency watermarks" in ZONE_NORMAL. Also:

    > I also made a run with the mempool-can-fail patch from Nick Piggin. With this
    > I got some nice memory allocation errors from the md threads when the trouble
    > started. The dump (with sysrq-t and sysrq-m included) is at:
    >
    > http://193.136.132.235/dl145/dump2-2.6.12-rc2-nick1.txt
    >

    This one shows plenty of memory. The allocation failure messages are
    actually a good thing, and show that my patch is sort of working. I
    have reworked it a bit so they won't show up though.

    So probably not your common or garden memory deadlock.

    The common theme seems to be: try_to_free_pages, swap_writepage,
    mempool_alloc, down/down_failed in .text.lock.md. Next I would suspect
    md/raid1 - maybe some deadlock in an uncommon memory allocation
    failure path?

    I'll see if I can reproduce it here.

    --
    SUSE Labs, Novell Inc.


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