panic: sx lock still held
cpuid = 1
time = 1559950395
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020f08760
vpanic() at vpanic+0x1e0/frame 0xfffffe0020f087c0
panic() at panic+0x43/frame 0xfffffe0020f08820
sx_destroy() at sx_destroy+0x5e/frame 0xfffffe0020f08840
solisten_proto() at solisten_proto+0xd2/frame 0xfffffe0020f088a0
tcp_usr_listen() at tcp_usr_listen+0x188/frame 0xfffffe0020f08900
solisten() at solisten+0x7a/frame 0xfffffe0020f08940
kern_listen() at kern_listen+0x132/frame 0xfffffe0020f08980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0020f08ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0020f08ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x4131ba, rsp = 0x7fffdfffdf38, rbp = 0x2 ---
KDB: enter: panic
[ thread pid 902 tid 100236 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why