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
