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SubjectRe: unregister_netdevice: waiting for DEV to become free (2)
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syzbot has found a reproducer for the following crash on:

HEAD commit: d7857ae43dcc Add linux-next specific files for 20180817
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13c72fce400000
kernel config: https://syzkaller.appspot.com/x/.config?x=4b10cd1ea76bb092
dashboard link: https://syzkaller.appspot.com/bug?extid=30209ea299c09d8785c9
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15df679a400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15242741400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+30209ea299c09d8785c9@syzkaller.appspotmail.com

IPVS: stopping master sync thread 4657 ...
IPVS: stopping master sync thread 4663 ...
IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0,
id = 0
IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0,
id = 0
IPVS: stopping master sync thread 4664 ...
unregister_netdevice: waiting for lo to become free. Usage count = 1

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