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

[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=130722df980000
start commit:   aef25be35d23 hexagon: Disable constant extender optimizati..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=108722df980000
console output: https://syzkaller.appspot.com/x/log.txt?x=170722df980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=5970f72a85a751ab7556
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15c06f44580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10ba37e8580000

Reported-by: syzbot+5970f72a85a751ab7556@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")

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