Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_checksum_update (2)

[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=14ec14b7980000
start commit:   00a7d39898c8 fs/pipe: add simpler helpers for common cases
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16ec14b7980000
console output: https://syzkaller.appspot.com/x/log.txt?x=12ec14b7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=523d3ff8e053340a
dashboard link: https://syzkaller.appspot.com/bug?extid=60ea31958b52b09e04af
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c56a54580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1158e4b7980000

Reported-by: syzbot+60ea31958b52b09e04af@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")

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