From: "Randy.Dunlap" <[email protected]>
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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