panic: sx lock still held
cpuid = 0
time = 1559955669
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f6d6750
vpanic() at vpanic+0x1e0/frame 0xfffffe001f6d67b0
panic() at panic+0x43/frame 0xfffffe001f6d6810
sx_destroy() at sx_destroy+0x5e/frame 0xfffffe001f6d6830
solisten_proto() at solisten_proto+0xd2/frame 0xfffffe001f6d6890
tcp_usr_listen() at tcp_usr_listen+0x188/frame 0xfffffe001f6d68f0
solisten() at solisten+0x7a/frame 0xfffffe001f6d6930
kern_listen() at kern_listen+0x132/frame 0xfffffe001f6d6970
ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe001f6d6ab0
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x8142d2e
KDB: enter: panic
[ thread pid 867 tid 100157 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why