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    SubjectRe: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2)


    On Sat, 17 May 2008, Alistair John Strachan wrote:
    >
    > My guess is that when the kernel runs out of MemFree and starts reclaiming the
    > cache, something is deadlocking somewhere. Just doing a:
    >
    > cat /dev/zero >/path/to/file

    Do this on the console (and having a serial console or working netconsole
    is a wonderful thing to log it, because otherwise it will generally just
    scroll off the screen), and trigger SysRQ-w. That dumps all blocked tasks
    to the screen.

    You may need to do

    echo 1 > /proc/sys/kernel/sysrq

    before that to enable it.

    (Or if you have some things still running because they haevn't hit the
    lock that causes the deadlock, you can try

    echo w > /proc/sysrq-trigger

    rather than the key combination).

    Linus


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