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    SubjectRe: Soft lockup problem
    On Mon 06-02-12 09:40:45, Gerard Saraber wrote:
    > Greetings everyone,
    > I've been having a bit of a problem since upgrading to the linux 3.x
    > series, I have a machine that we're using as a NAS that runs various
    > rsync processes (mostly at night), lately after a day or two, I will
    > come in in the morning to a load average of 49, but the machine not
    > really doing anything, when trying to run 'dstat' the command just
    > hung with no output at all. there were no errors in the logs, or even
    > anything that would vaguely point at anything I could work with.
    > So needing to get the machine back to work I attempted to reboot it
    > "shutdown -r now" on console... it gives a nice message saying it's
    > going to reboot, but nothing ever happens.. the only way to reboot it
    > is by using ctrl + alt + sysrq + b. after which the machine reboots
    > and the raid array comes back clean.
    > I'm not sure how to troubleshoot this, any pointers would be appreciated.
    > I'm compiling 3.2.4 at the moment and found a bunch of possibly useful
    > options in the kernel debugging section:
    > detect hard/soft lockups and detect hung tasks, maybe it'll give me
    > something more to go on.
    > Some details about the machine:
    > Linux xenbox 3.2.2 #1 SMP Sun Jan 29 10:28:22 CST 2012 x86_64 Intel(R)
    > Xeon(R) CPU 5140 @ 2.33GHz GenuineIntel GNU/Linux
    > It has 3 software raid arrays (2 x 5 drives and 1 x 4 drives) LVM'ed
    > together into a 23TB XFS filesystem.
    > 6GB memory and a pair of Intel Gigabit ethernet controllers bonded together.
    Hmm, might be some deadlock in the filesystem. Adding XFS guys to CC.
    Can you run 'echo w >/proc/sysrq-trigger' and post output of dmesg here?

    Jan Kara <>
    SUSE Labs, CR

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