panic: inp_leave_group: imf_sources not empty cpuid = 1 time = 1560708994 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f767510 vpanic() at vpanic+0x1e0/frame 0xfffffe001f767570 panic() at panic+0x43/frame 0xfffffe001f7675d0 inp_setmoptions() at inp_setmoptions+0x40bd/frame 0xfffffe001f7677b0 ip_ctloutput() at ip_ctloutput+0x7fd/frame 0xfffffe001f767800 rip_ctloutput() at rip_ctloutput+0x2c9/frame 0xfffffe001f767840 sosetopt() at sosetopt+0x101/frame 0xfffffe001f7678c0 kern_setsockopt() at kern_setsockopt+0x158/frame 0xfffffe001f767940 sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe001f767970 ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe001f767ab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x81430ec KDB: enter: panic [ thread pid 10176 tid 100631 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why