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SubjectRe: [syzbot] possible deadlock in f_getown
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syzbot suspects this issue was fixed by commit:

commit f671a691e299f58835d4660d642582bf0e8f6fda
Author: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Date: Fri Jul 2 09:18:30 2021 +0000

fcntl: fix potential deadlocks for &fown_struct.lock

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15fa8017300000
start commit: 293837b9ac8d Revert "i915: fix remap_io_sg to verify the p..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=18fade5827eb74f7
dashboard link: https://syzkaller.appspot.com/bug?extid=8073030e235a5a84dd31
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171390add00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10050553d00000

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

#syz fix: fcntl: fix potential deadlocks for &fown_struct.lock

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

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