panic: Assertion in_epoch(net_epoch_preempt) failed at /syzkaller/managers/i386/kernel/sys/netinet6/in6.c:1479
cpuid = 1
time = 1570919033
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001a1594f0
vpanic() at vpanic+0x1c7/frame 0xfffffe001a159560
panic() at panic+0x43/frame 0xfffffe001a1595c0
in6ifa_ifpforlinklocal() at in6ifa_ifpforlinklocal+0x143/frame 0xfffffe001a1595f0
nd6_prefix_onlink() at nd6_prefix_onlink+0x254/frame 0xfffffe001a159770
pfxlist_onlink_check() at pfxlist_onlink_check+0x521/frame 0xfffffe001a159800
defrouter_del() at defrouter_del+0x20c/frame 0xfffffe001a159840
nd6_timer() at nd6_timer+0x1c2/frame 0xfffffe001a1598d0
softclock_call_cc() at softclock_call_cc+0x218/frame 0xfffffe001a1599b0
softclock() at softclock+0xa3/frame 0xfffffe001a1599f0
ithread_loop() at ithread_loop+0x2f2/frame 0xfffffe001a159a60
fork_exit() at fork_exit+0xac/frame 0xfffffe001a159ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe001a159ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100018 ]
Stopped at      kdb_enter+0x67: movq    $0,0x14776e6(%rip)