Panic on head (r255759)

> Unread portion of the kernel message buffer:
> panic: Lock lle not exclusively locked _at_ /usr/src/sys/kern/kern_rwlock.c:140
> 
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe118aeef820
> kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe118aeef8d0
> vpanic() at vpanic+0x126/frame 0xfffffe118aeef910
> panic() at panic+0x43/frame 0xfffffe118aeef970
> __rw_assert() at __rw_assert+0xa3/frame 0xfffffe118aeef980
> _callout_stop_safe() at _callout_stop_safe+0x54/frame 0xfffffe118aeef9f0
> arptimer() at arptimer+0x14e/frame 0xfffffe118aeefa30
> softclock_call_cc() at softclock_call_cc+0x188/frame 0xfffffe118aeefb10
> softclock() at softclock+0x47/frame 0xfffffe118aeefb30
> intr_event_execute_handlers() at intr_event_execute_handlers+0x93/frame 0xfffffe118aeefb70
> ithread_loop() at ithread_loop+0xa6/frame 0xfffffe118aeefbb0
> fork_exit() at fork_exit+0x84/frame 0xfffffe118aeefbf0
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe118aeefbf0
> --- trap 0, rip = 0, rsp = 0xfffffe118aeefcb0, rbp = 0 ---


-- 
Regards,
Bryan Drewery