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SubjectRe: WARNING: locking bug in rhashtable_walk_enter
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syzbot has bisected this bug to:

commit 7e27e8d6130c5e88fac9ddec4249f7f2337fe7f8
Author: Junwei Hu <hujunwei4@huawei.com>
Date: Thu May 16 02:51:15 2019 +0000

tipc: switch order of device registration to fix a crash

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1285d39ca00000
start commit: f49aa1de Merge tag 'for-5.2-rc1-tag' of git://git.kernel.o..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=1185d39ca00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1685d39ca00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fc045131472947d7
dashboard link: https://syzkaller.appspot.com/bug?extid=6440134c13554d3abfb0
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c586bca00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14759fb2a00000

Reported-by: syzbot+6440134c13554d3abfb0@syzkaller.appspotmail.com
Fixes: 7e27e8d6130c ("tipc: switch order of device registration to fix a
crash")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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