panic: inp_leave_group: imf_sources not empty cpuid = 0 time = 1555940445 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021240520 vpanic() at vpanic+0x1e0/frame 0xfffffe0021240580 panic() at panic+0x43/frame 0xfffffe00212405e0 inp_setmoptions() at inp_setmoptions+0x40bd/frame 0xfffffe00212407c0 ip_ctloutput() at ip_ctloutput+0x80f/frame 0xfffffe0021240810 rip_ctloutput() at rip_ctloutput+0x2c9/frame 0xfffffe0021240850 sosetopt() at sosetopt+0x101/frame 0xfffffe00212408d0 kern_setsockopt() at kern_setsockopt+0x158/frame 0xfffffe0021240950 sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe0021240980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021240ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021240ab0 --- syscall (0, FreeBSD ELF64, nosys), rip = 0x45763a, rsp = 0x7fffdffdcf88, rbp = 0x6b5bc0 --- KDB: enter: panic [ thread pid 1118 tid 100822 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why