[6.1-PRERELEASE/amd64] Kernel panic during heavy UFS traffic

Kris Kennaway kris at obsecurity.org
Thu Mar 16 19:54:07 UTC 2006

On Thu, Mar 16, 2006 at 12:45:07PM -0600, Jason Harmening wrote:
> Last night I ran into a series of kernel panics that seemed to be related to
> heavy UFS traffic.  I ran into two consecutive panics when trying to mount a
> UFS-formatted DVD-RAM as a regular user (though not when I mounted it as
> root).  The system seemed to actually succeed in mounting the disk, as it
> was marked dirty after the ensuing panic.  Upon rebooting after the second
> panic, I saw another two consecutive panics which happened whenever I tried
> to do something fairly disk-intensive (e.g. starting the X server + KDE)
> while the bgfsck was still running from the last panic.  Ultimately I
> rebooted in single-user mode, ran fsck manually, and have experienced no
> further panics.  I suspect these panics may be related to UFS deadlocks, as
> in all cases the application that was attempting disk access hung for
> several seconds before the panic, followed by a few seconds of total system
> hang, followed by the automatic reboot.
> I'm running 6.1-PRELEASE/amd64 from 12 March on an Athlon 64 x2 (SMP) with
> SCHED_ULE+PREEMPTION--dangerous combination I know, but it's been rock solid
> for months until now.  If anyone is interested, I'll try to reproduce this
> panic with a dump/backtrace.  It may be one of the UFS deadlock issues
> that's already under investigation for 6.1-RELEASE.

Yeah, we need a trace.

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