Re: [syzbot] [bcachefs] KASAN: use-after-free Read in crypto_poly1305_update

[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=15a303a4580000
start commit:   2408a807bfc3 Merge tag 'vfs-6.14-rc4.fixes' of git://git.k..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17a303a4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=13a303a4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6cc40dfe827ffb85
dashboard link: https://syzkaller.appspot.com/bug?extid=d587b24799bd8c2d32f4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c4f2e4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e4c498580000

Reported-by: syzbot+d587b24799bd8c2d32f4@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")

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