May 26 14:02:53 venus reboot[50608]: rebooted by root
May 26 14:02:53 venus syslogd: exiting on signal 15
panic: negative refcount 0xfffff8002717643c
cpuid = 4
time = 1527336173
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0077b96660
vpanic() at vpanic+0x1a3/frame 0xfffffe0077b966c0
doadump() at doadump/frame 0xfffffe0077b96740
ifa_free() at ifa_free+0x35/frame 0xfffffe0077b96760
in_difaddr_ioctl() at in_difaddr_ioctl+0x460/frame 0xfffffe0077b967c0
in_ifscrub_all() at in_ifscrub_all+0xff/frame 0xfffffe0077b96850
ip_destroy() at ip_destroy+0xbd/frame 0xfffffe0077b96870
vnet_destroy() at vnet_destroy+0x12c/frame 0xfffffe0077b968a0
prison_deref() at prison_deref+0x29d/frame 0xfffffe0077b968e0
taskqueue_run_locked() at taskqueue_run_locked+0x14c/frame 0xfffffe0077b96940
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe0077b96970
fork_exit() at fork_exit+0x84/frame 0xfffffe0077b969b0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0077b969b0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic