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SubjectRe: [syzbot] BUG: unable to handle kernel NULL pointer dereference in kiocb_done
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syzbot suspects this issue was fixed by commit:

commit b8ce1b9d25ccf81e1bbabd45b963ed98b2222df8
Author: Pavel Begunkov <asml.silence@gmail.com>
Date: Tue Aug 31 13:13:11 2021 +0000

io_uring: don't submit half-prepared drain request

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17b14b67300000
start commit: 4ac6d90867a4 Merge tag 'docs-5.15' of git://git.lwn.net/li..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=3c3a5498e99259cf
dashboard link: https://syzkaller.appspot.com/bug?extid=726f2ce6dbbf2ad8d133
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124a3b49300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142e610b300000

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

#syz fix: io_uring: don't submit half-prepared drain request

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

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