login: panic: udp_output: shared udbinfo lock, excl inp lock
cpuid = 1
time = 1552655527
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212cc560
vpanic() at vpanic+0x1e0/frame 0xfffffe00212cc5c0
panic() at panic+0x43/frame 0xfffffe00212cc620
udp_send() at udp_send+0x1377/frame 0xfffffe00212cc730
sosend_dgram() at sosend_dgram+0x550/frame 0xfffffe00212cc7a0
sosend() at sosend+0xc6/frame 0xfffffe00212cc810
kern_sendit() at kern_sendit+0x35e/frame 0xfffffe00212cc8c0
sendit() at sendit+0x226/frame 0xfffffe00212cc920
sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe00212cc980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212ccab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212ccab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdfffdf38, rbp = 0x3 ---
KDB: enter: panic
[ thread pid 7364 tid 100191 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why