panic: Assertion in_epoch(net_epoch_preempt) failed at /syzkaller/managers/main/kernel/sys/netinet6/in6_ifattach.c:251 cpuid = 0 time = 1571264982 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001a154710 vpanic() at vpanic+0x1c7/frame 0xfffffe001a154780 panic() at panic+0x43/frame 0xfffffe001a1547e0 in6_get_hw_ifid() at in6_get_hw_ifid+0x33a/frame 0xfffffe001a154820 nd6_dad_timer() at nd6_dad_timer+0x600/frame 0xfffffe001a1548d0 softclock_call_cc() at softclock_call_cc+0x218/frame 0xfffffe001a1549b0 softclock() at softclock+0xa3/frame 0xfffffe001a1549f0 ithread_loop() at ithread_loop+0x2f2/frame 0xfffffe001a154a60 fork_exit() at fork_exit+0xac/frame 0xfffffe001a154ab0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe001a154ab0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- KDB: enter: panic [ thread pid 12 tid 100017 ] Stopped at kdb_enter+0x67: movq $0,0x14776c6(%rip)