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charset="UTF-8" syzbot has bisected this issue to: commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b Author: Kent Overstreet Date: Sat Sep 23 22:41:51 2023 +0000 bcachefs: Ignore unknown mount options bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14fdf9a8980000 start commit: ddb4c3f25b7b Merge tag 'for-linus-6.9a-rc7-tag' of git://g.. git tree: upstream final oops: https://syzkaller.appspot.com/x/report.txt?x=16fdf9a8980000 console output: https://syzkaller.appspot.com/x/log.txt?x=12fdf9a8980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d2f00edef461175 dashboard link: https://syzkaller.appspot.com/bug?extid=05c1843ef85da9e52042 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1464ea2f180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130db31f180000 Reported-by: syzbot+05c1843ef85da9e52042@syzkaller.appspotmail.com Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options") For information about bisection process see: https://goo.gl/tpsmEJ#bisection