panic: sbflush_internal: ccc 0 mb 0 mbcnt 256
cpuid = 1
time = 1559995868
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020f17730
vpanic() at vpanic+0x1e0/frame 0xfffffe0020f17790
panic() at panic+0x43/frame 0xfffffe0020f177f0
sbrelease_internal() at sbrelease_internal+0x174/frame 0xfffffe0020f17830
solisten_proto() at solisten_proto+0xc6/frame 0xfffffe0020f17890
sctp_listen() at sctp_listen+0x4eb/frame 0xfffffe0020f17900
solisten() at solisten+0x7a/frame 0xfffffe0020f17940
kern_listen() at kern_listen+0x132/frame 0xfffffe0020f17980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0020f17ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0020f17ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x4131ba, rsp = 0x7fffdfffdf38, rbp = 0x2 ---
KDB: enter: panic
[ thread pid 1001 tid 100303 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why