Re: [syzbot] [reiserfs?] [squashfs?] BUG: Dentry still in use in unmount

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syzbot has bisected this issue to:

commit c63e56a4a6523fcb1358e1878607d77a40b534bb
Author: Amir Goldstein <amir73il@xxxxxxxxx>
Date:   Wed Aug 16 09:42:18 2023 +0000

    ovl: do not open/llseek lower file with upper sb_writers held

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13723c01e80000
start commit:   3bd7d7488169 Merge tag 'io_uring-6.7-2023-12-15' of git://..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10f23c01e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=17723c01e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=53ec3da1d259132f
dashboard link: https://syzkaller.appspot.com/bug?extid=8608bb4553edb8c78f41
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17b8b6e1e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ec773ae80000

Reported-by: syzbot+8608bb4553edb8c78f41@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c63e56a4a652 ("ovl: do not open/llseek lower file with upper sb_writers held")

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




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