Date: Fri, 6 Jun 2014 11:33:24 -0400 From: Glen Barber <gjb@FreeBSD.org> To: freebsd-current@FreeBSD.org Subject: Re: panic in deadlkres() on r267110 Message-ID: <20140606153324.GK33882@hub.FreeBSD.org> In-Reply-To: <20140606150640.GI33882@hub.FreeBSD.org> References: <20140606141215.GE33882@hub.FreeBSD.org> <1402064629.1123.46.camel@bruno> <20140606150640.GI33882@hub.FreeBSD.org>
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On Fri, Jun 06, 2014 at 11:06:40AM -0400, Glen Barber wrote:
> 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
>=20
> Some more debug information. Thank you to Attilio for information on
> what data to get.
>=20
Sorry, I did not mask the bits properly.
Script started on Fri Jun 6 15:20:14 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 *)0xfffff813ae7f4920)
$4 =3D (struct thread *) 0xfffff813ae7f4920
(kgdb) p $4->td_tid
$5 =3D 195038
(kgdb) tid 195038
[Switching to thread 94414 (Thread 195038)]#0 0xffffffff80daf1f8 in cpusto=
p_handler () at /usr/src/sys/amd64/amd64/mp_machdep.c:1432
1432 savectx(&stoppcbs[cpu]);
(kgdb) bt
#0 0xffffffff80daf1f8 in cpustop_handler ()
at /usr/src/sys/amd64/amd64/mp_machdep.c:1432
#1 0xffffffff80daf1bf in ipi_nmi_handler ()
at /usr/src/sys/amd64/amd64/mp_machdep.c:1417
#2 0xffffffff80dbfcba in trap (frame=3D0xfffffe17d5389f30)
at /usr/src/sys/amd64/amd64/trap.c:189
#3 0xffffffff80da2e03 in nmi_calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:504
#4 0xffffffff8092fa39 in fork1 (td=3D0xfffff813ae7f4920, flags=3D20, pages=
=3DCannot access memory at address 0x4
)
at /usr/src/sys/kern/kern_fork.c:268
#5 0xffffffff8092f00f in sys_fork (td=3D0xfffff813ae7f4920,=20
uap=3D<value optimized out>) at /usr/src/sys/kern/kern_fork.c:106
#6 0xffffffff80dc118b in amd64_syscall (td=3D0xfffff813ae7f4920, traced=3D=
0)
at subr_syscall.c:133
#7 0xffffffff80da2cab in Xfast_syscall ()
at /usr/src/sys/amd64/amd64/exception.S:390
#8 0x0000000800d46d1a in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)=20
Glen
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