panic: sx lock still held
cpuid = 0
time = 1570705061
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0022b43750
vpanic() at vpanic+0x1c7/frame 0xfffffe0022b437c0
panic() at panic+0x43/frame 0xfffffe0022b43820
sx_destroy() at sx_destroy+0x63/frame 0xfffffe0022b43840
solisten_proto() at solisten_proto+0xd2/frame 0xfffffe0022b438a0
tcp_usr_listen() at tcp_usr_listen+0x188/frame 0xfffffe0022b43900
solisten() at solisten+0x7a/frame 0xfffffe0022b43940
kern_listen() at kern_listen+0x125/frame 0xfffffe0022b43980
amd64_syscall() at amd64_syscall+0x473/frame 0xfffffe0022b43ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0022b43ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x4132aa, rsp = 0x7fffdffdcf38, rbp = 0x2 ---
KDB: enter: panic
[ thread pid 964 tid 100220 ]
Stopped at      kdb_enter+0x67: movq    $0,0x1477516(%rip)