Date: Fri, 6 Jun 2014 11:06:40 -0400 From: Glen Barber <gjb@FreeBSD.org> To: sbruno@freebsd.org Cc: freebsd-current@FreeBSD.org Subject: Re: panic in deadlkres() on r267110 Message-ID: <20140606150640.GI33882@hub.FreeBSD.org> In-Reply-To: <1402064629.1123.46.camel@bruno> References: <20140606141215.GE33882@hub.FreeBSD.org> <1402064629.1123.46.camel@bruno>
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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.
> >=20
> > Any ideas or information on how to further debug this would be
> > appreciated.
> >=20
> These machines were happily running r266621 previously to this update
> yesterday. So, that gives us a bisection point.
>=20
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=3D-946873840) at pcpu.h:219
219 __asm("movq %%gs:%1,%0" : "=3Dr" (td)
(kgdb) p/x allproc_lock.sx_lock
$1 =3D 0xfffff813ae7f4924
Current language: auto; currently minimal
(kgdb) p ((struct thread *)0xfffff813ae7f4924)
$2 =3D (struct thread *) 0xfffff813ae7f4924
(kgdb) p $2->td_tid
$3 =3D 0
(kgdb) ^D
# ^D
Script done on Fri Jun 6 15:03:19 2014
Glen
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