Re: soft lockup disease (2.6.14-rc1, x86_64)

From: David S. Miller (davem_at_davemloft.net)
Date: 09/16/05

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    Date:	Thu, 15 Sep 2005 21:55:27 -0700 (PDT)
To: rdunlap@xenotime.net

    From: "Randy.Dunlap" <rdunlap@xenotime.net>
    Date: Thu, 15 Sep 2005 15:20:03 -0700 (PDT)

    > (somewhat like http://bugzilla.kernel.org/show_bug.cgi?id=5159 )
    > but not IO/Storage related AFAICT, and not xseries.
    >
    > It always includes ext3 in the backtrace (from what I have noticed).
    > [The serial console output appears a bit garbled.]
    >
    > Are there patches for this or is it an outstanding issue?

    I've seen similar triggers on sparc64 from a reporter, but
    it was NFSD and slab poisioning in the backtrace in that case.

    I think the common denominator is the presence of very busy kernel
    daemons unable to schedule out to let other tasks (and in particular
    the per-cpu softlockup daemon) onto the cpu.

    Looking at KNFSD specifically, I don't see anywhere that it tries to
    yield the cpu if it's been working for too long.

    I guess that's exactly what the softlockup thing was meant to catch
    :-)
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