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SubjectRe: possible deadlock in free_ioctx_users (2)
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syzbot has bisected this bug to:

commit 7bc3e6e55acf065500a24621f3b313e7e5998acf
Author: Eric W. Biederman <ebiederm@xmission.com>
Date: Thu Feb 20 00:22:26 2020 +0000

proc: Use a list of inodes to flush from proc

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=164ae51fe00000
start commit: 7be97138 Merge tag 'xfs-5.7-merge-8' of git://git.kernel.o..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=154ae51fe00000
console output: https://syzkaller.appspot.com/x/log.txt?x=114ae51fe00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ec722f9d4eb221d2
dashboard link: https://syzkaller.appspot.com/bug?extid=832aabf700bc3ec920b9
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10f37663e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16feb91fe00000

Reported-by: syzbot+832aabf700bc3ec920b9@syzkaller.appspotmail.com
Fixes: 7bc3e6e55acf ("proc: Use a list of inodes to flush from proc")

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

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