panic: inp_leave_group: imf_sources not empty cpuid = 0 time = 1560990669 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020f6c510 vpanic() at vpanic+0x1e0/frame 0xfffffe0020f6c570 panic() at panic+0x43/frame 0xfffffe0020f6c5d0 inp_setmoptions() at inp_setmoptions+0x40bd/frame 0xfffffe0020f6c7b0 ip_ctloutput() at ip_ctloutput+0x7fd/frame 0xfffffe0020f6c800 rip_ctloutput() at rip_ctloutput+0x2c9/frame 0xfffffe0020f6c840 sosetopt() at sosetopt+0x101/frame 0xfffffe0020f6c8c0 kern_setsockopt() at kern_setsockopt+0x158/frame 0xfffffe0020f6c940 sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe0020f6c970 ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe0020f6cab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x8143102 KDB: enter: panic [ thread pid 7896 tid 100216 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why