Re: [syzbot] [bcachefs?] [ext4?] WARNING: suspicious RCU usage in bch2_fs_quota_read

[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=16f8862f180000
start commit:   7367539ad4b0 Merge tag 'cxl-fixes-6.9-rc7' of git://git.ke..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15f8862f180000
console output: https://syzkaller.appspot.com/x/log.txt?x=11f8862f180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d2f00edef461175
dashboard link: https://syzkaller.appspot.com/bug?extid=a3a9a61224ed3b7f0010
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12376338980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16047450980000

Reported-by: syzbot+a3a9a61224ed3b7f0010@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")

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