panic in deadlkres() on r267110

[Glen Barber]

On Fri, Jun 06, 2014 at 07:23:49AM -0700, Sean Bruno wrote:
> On Fri, 2014-06-06 at 10:12 -0400, Glen Barber wrote:
> > Two machines in the cluster panic last night with the same backtrace.
> > It is unclear yet exactly what was happening on the systems, but both
> > are port building machines using ports-mgmt/tinderbox.
> > 
> > Any ideas or information on how to further debug this would be
> > appreciated.
> > 
> These machines were happily running r266621 previously to this update
> yesterday.  So, that gives us a bisection point.
> 

Some more debug information.  Thank you to Attilio for information on
what data to get.

Script started on Fri Jun  6 15:00:53 2014
command: /bin/sh
# kgdb ./kernel.debug /var/crash/vmcore.0
[...]
#0  doadump (textdump=-946873840) at pcpu.h:219
219             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) p/x allproc_lock.sx_lock
$1 = 0xfffff813ae7f4924
Current language:  auto; currently minimal
(kgdb) p ((struct thread *)0xfffff813ae7f4924)
$2 = (struct thread *) 0xfffff813ae7f4924
(kgdb) p $2->td_tid
$3 = 0
(kgdb) ^D
# ^D
Script done on Fri Jun  6 15:03:19 2014

Glen

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