amd64-8.1_STABLE panic

["John D. Baker" <jdbaker%consolidated.net@localhost>]

At about 2:00a.m. my file server panicked.  It runs 8.1_STABLE amd64.
Backtrace from crash(8):

Crash version 8.1_STABLE, image version 8.1_STABLE.
System panicked: trap
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NAGR() at 0
?() at ffff80005e49c000
vpanic() at vpanic+0x166
snprintf() at snprintf
trap() at trap+0xa00
--- trap (number 6) ---
cache_disassociate() at cache_disassociate+0x87
cache_reclaim() at cache_reclaim+0x22a
cache_thread() at cache_thread+0x15


It was doing a non-update build of HEAD at the time.

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