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SubjectRe: possible deadlock in console_unlock
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syzbot has bisected this bug to:

commit b6da31b2c07c46f2dcad1d86caa835227a16d9ff
Author: DaeRyong Jeong <threeearcat@gmail.com>
Date: Mon Apr 30 15:27:04 2018 +0000

tty: Fix data race in tty_insert_flip_string_fixed_flag

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d9bc0ee00000
start commit: 0ad39cb3 Merge tag 'kconfig-v4.18' of git://git.kernel.org..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=11d9bc0ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=16d9bc0ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b9a1f3aa8b8ddd16
dashboard link: https://syzkaller.appspot.com/bug?extid=43e93968b964e369db0b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c89b9f800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167f596f800000

Reported-by: syzbot+43e93968b964e369db0b@syzkaller.appspotmail.com
Fixes: b6da31b2c07c ("tty: Fix data race in
tty_insert_flip_string_fixed_flag")

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

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