syzbot has bisected this issue to:
commit cebe85d570cf84804e848332d6721bc9e5300e07
Author: Lukas Czerner <lczerner@xxxxxxxxxx>
Date: Wed Oct 27 14:18:56 2021 +0000
ext4: switch to the new mount api
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14902978700000
start commit: 0457e5153e0e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=16902978700000
console output: https://syzkaller.appspot.com/x/log.txt?x=12902978700000
kernel config: https://syzkaller.appspot.com/x/.config?x=cd57c0f940a9a1ec
dashboard link: https://syzkaller.appspot.com/bug?extid=138c9e58e3cb22eae3b4
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17f7004fb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=178cf108700000
Reported-by: syzbot+138c9e58e3cb22eae3b4@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: cebe85d570cf ("ext4: switch to the new mount api")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
