panic: inp_join_group: imf_sources not empty cpuid = 0 time = 1554279027 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212db520 vpanic() at vpanic+0x1e0/frame 0xfffffe00212db580 panic() at panic+0x43/frame 0xfffffe00212db5e0 inp_setmoptions() at inp_setmoptions+0x4023/frame 0xfffffe00212db7c0 ip_ctloutput() at ip_ctloutput+0x80f/frame 0xfffffe00212db810 rip_ctloutput() at rip_ctloutput+0x2c9/frame 0xfffffe00212db850 sosetopt() at sosetopt+0x101/frame 0xfffffe00212db8d0 kern_setsockopt() at kern_setsockopt+0x158/frame 0xfffffe00212db950 sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe00212db980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212dbab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212dbab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412f1a, rsp = 0x7fffdfffdf38, rbp = 0x5 --- KDB: enter: panic [ thread pid 986 tid 100715 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why