syzbot has bisected this issue to:
commit 2acf15b94d5b8ea8392c4b6753a6ffac3135cd78
Author: Yu Kuai <yukuai3@xxxxxxxxxx>
Date: Fri Jul 2 04:07:43 2021 +0000
reiserfs: add check for root_inode in reiserfs_fill_super
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1715ffdd280000
start commit: f8dba31b0a82 Merge tag 'asym-keys-fix-for-linus-v6.4-rc5' ..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=1495ffdd280000
console output: https://syzkaller.appspot.com/x/log.txt?x=1095ffdd280000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c980bfe8b399968
dashboard link: https://syzkaller.appspot.com/bug?extid=b23c4c9d3d228ba328d7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1680f7d1280000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12fad50d280000
Reported-by: syzbot+b23c4c9d3d228ba328d7@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 2acf15b94d5b ("reiserfs: add check for root_inode in reiserfs_fill_super")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
