login: panic: udp_output: shared udbinfo lock, excl inp lock cpuid = 1 time = 1555565685 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021236560 vpanic() at vpanic+0x1e0/frame 0xfffffe00212365c0 panic() at panic+0x43/frame 0xfffffe0021236620 udp_send() at udp_send+0x1377/frame 0xfffffe0021236730 sosend_dgram() at sosend_dgram+0x550/frame 0xfffffe00212367a0 sosend() at sosend+0xc6/frame 0xfffffe0021236810 kern_sendit() at kern_sendit+0x35e/frame 0xfffffe00212368c0 sendit() at sendit+0x226/frame 0xfffffe0021236920 sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe0021236980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021236ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021236ab0 --- syscall (0, FreeBSD ELF64, nosys), rip = 0x41c3aa, rsp = 0x7fffffffeae8, rbp = 0x7fffffffeb40 --- KDB: enter: panic [ thread pid 759 tid 100104 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why