panic: udp_output: shared udbinfo lock, excl inp lock cpuid = 1 time = 1558261742 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe002112b550 vpanic() at vpanic+0x1e0/frame 0xfffffe002112b5b0 panic() at panic+0x43/frame 0xfffffe002112b610 udp_send() at udp_send+0x139c/frame 0xfffffe002112b730 sosend_dgram() at sosend_dgram+0x550/frame 0xfffffe002112b7a0 sosend() at sosend+0xc6/frame 0xfffffe002112b810 kern_sendit() at kern_sendit+0x35e/frame 0xfffffe002112b8c0 sendit() at sendit+0x226/frame 0xfffffe002112b920 sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe002112b980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe002112bab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe002112bab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdfffdf38, rbp = 0x3 --- KDB: enter: panic [ thread pid 21428 tid 101145 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why