panic: witness_warn head/amd64 @r285741 on 1 of 2 machines

[Konstantin Belousov]

On Tue, Jul 21, 2015 at 05:57:34AM -0700, David Wolfskill wrote:
> My laptop had no problems, but the build machine has a panic that
> appears quite reproducible (4 "successes" out of 4 tries); here's a bit
> from the core.txt file:

There must be kernel messages before the panic string.  They are crusial
to understand what is going on.

> 
> freebeast.catwhisker.org dumped core - see /var/crash/vmcore.1
> 
> Tue Jul 21 05:36:11 PDT 2015
> 
> FreeBSD freebeast.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1787  r285741M/285741:1100077: Tue Jul 21 04:48:37 PDT 2015     root at freebeast.catwhisker.org:/common/S4/obj/usr/src/sys/GENERIC  amd64
> 
> panic: witness_warn