panic: Assertion in_epoch(net_epoch_preempt) failed at /syzkaller/managers/i386/kernel/sys/netinet6/in6.c:LINE

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syzbot

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Oct 12, 2019, 6:24:08 PM10/12/19
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Hello,

syzbot found the following crash on:

HEAD commit: b9f81c44 Ensure that local variables are reset to their in..
git tree: freebsd
console output: https://syzkaller.appspot.com/x/log.txt?x=172f7a30e00000
dashboard link: https://syzkaller.appspot.com/bug?extid=0e1d88b915d56d5eace8
userspace arch: i386

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0e1d88...@syzkaller.appspotmail.com

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)


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syzbot

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Jan 10, 2020, 5:24:06 PM1/10/20
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Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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