jenkins bhyve vms crashing and burning after several days of use

[Sean Bruno]

so, we're seeing the bhyve vms running in the freebsd cluster for
jenkins crashing and burning after a couple of days of use.

vm exit[9]
reason          VMX
rip             0x0000000029286336 
inst_length     3
status          0
exit_reason     49
qualification   0x0000000000000000
inst_type       0
inst_error      0 


It looks like we have an active core file on havoc.ysv if you have a
moment to look at it:

http://people.freebsd.org/~sbruno/bhyve.core

FreeBSD havoc.ysv.freebsd.org 11.0-CURRENT FreeBSD 11.0-CURRENT #2
r267362: Wed Jun 11 14:56:34 UTC 2014
sbruno at havoc.freebsd.org:/usr/obj/usr/src/sys/HAVOC  amd64