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SubjectRe: possible deadlock in pipe_lock (3)
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syzbot suspects this bug was fixed by commit:

commit 1a980b8cbf0059a5308eea61522f232fd03002e2
Author: Murphy Zhou <jencce.kernel@gmail.com>
Date: Fri Jan 17 12:49:29 2020 +0000

ovl: add splice file read write helper

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12dd7dc3e00000
start commit: 46cf053e Linux 5.5-rc3
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=ed9d672709340e35
dashboard link: https://syzkaller.appspot.com/bug?extid=217d60b447573313b211
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116496c1e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10104649e00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: ovl: add splice file read write helper

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

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