Re: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in read_one_super

[syzbot]

syzbot has bisected this issue to:

commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b
Author: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Date:   Sat Sep 23 22:41:51 2023 +0000

    bcachefs: Ignore unknown mount options

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=149d2fff180000
start commit:   dd5a440a31fa Linux 6.9-rc7
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=169d2fff180000
console output: https://syzkaller.appspot.com/x/log.txt?x=129d2fff180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d7ea7de0cb32587
dashboard link: https://syzkaller.appspot.com/bug?extid=a8b0fb419355c91dda7f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=135bf574980000

Reported-by: syzbot+a8b0fb419355c91dda7f@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")

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