Deadlock with option FULL_PREEMPTION
John Baldwin
jhb at FreeBSD.org
Tue Feb 8 10:32:14 PST 2005
On Sunday 06 February 2005 08:41 am, Peter Holm wrote:
> With GENERIC HEAD from Feb 5 09:19 UTC + FULL_PREEMPTION +
> mpsafe_vfs = 1 I ran into what appears to be the same deadlock
> twice. This is the first one:
> http://www.holm.cc/stress/log/cons114.html
What is the deadlock exactly? It looks like lots of threads banging on fork()
and that they are all waiting on an exclusive lock of allproc_lock while
holding a shared lock of proctree_lock (except for the 1 thread currently
doing a fork that is on a run queue because it was preempted by IRQ 0 which
kicked off softclock). Can you get 'ps' output?
--
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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