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SubjectRe: KASAN: use-after-free Write in __vb2_cleanup_fileio
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syzbot has bisected this bug to:

commit 4493b81bea24269df898339dee638d7c5cb2b2df
Author: Mahesh Bandewar <maheshb@google.com>
Date: Wed Mar 8 18:55:54 2017 +0000

bonding: initialize work-queues during creation of bond

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1232b037200000
start commit: 4493b81b bonding: initialize work-queues during creation o..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=1132b037200000
console output: https://syzkaller.appspot.com/x/log.txt?x=1632b037200000
kernel config: https://syzkaller.appspot.com/x/.config?x=62118286bb772a24
dashboard link: https://syzkaller.appspot.com/bug?extid=4e12d2d56f8ccc65c180
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1346e183400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117c2713400000

Reported-by: syzbot+4e12d2d56f8ccc65c180@syzkaller.appspotmail.com
Fixes: 4493b81bea24 ("bonding: initialize work-queues during creation of
bond")

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

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