panic: sx lock still held
cpuid = 1
time = 1565022069
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021308760
vpanic() at vpanic+0x1e0/frame 0xfffffe00213087c0
panic() at panic+0x43/frame 0xfffffe0021308820
sx_destroy() at sx_destroy+0x5e/frame 0xfffffe0021308840
solisten_proto() at solisten_proto+0xd2/frame 0xfffffe00213088a0
tcp6_usr_listen() at tcp6_usr_listen+0x1cc/frame 0xfffffe0021308900
solisten() at solisten+0x7a/frame 0xfffffe0021308940
kern_listen() at kern_listen+0x13c/frame 0xfffffe0021308980
amd64_syscall() at amd64_syscall+0x479/frame 0xfffffe0021308ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021308ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41328a, rsp = 0x7fffdffdcf38, rbp = 0x2 ---
KDB: enter: panic
[ thread pid 1557 tid 100978 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why