syzbot has bisected this issue to:
commit 5872331b3d91820e14716632ebb56b1399b34fe1
Author: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Wed Jun 17 19:19:04 2020 +0000
ext4: fix potential negative array index in do_split()
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=122e44b7980000
start commit: 7eb172143d55 Linux 6.14-rc5
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=112e44b7980000
console output: https://syzkaller.appspot.com/x/log.txt?x=162e44b7980000
kernel config: https://syzkaller.appspot.com/x/.config?x=523d3ff8e053340a
dashboard link: https://syzkaller.appspot.com/bug?extid=2f2bc79f24dae1dc62b6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=126fd5a8580000
Reported-by: syzbot+2f2bc79f24dae1dc62b6@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 5872331b3d91 ("ext4: fix potential negative array index in do_split()")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
