linux-kernel - Re: [syzbot] [udf?] BUG: unable to handle kernel NULL pointer dereference in _

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Message-ID: <0000000000009cfc1705f2a07641@google.com>
Date:   Thu, 19 Jan 2023 08:31:22 -0800
From:   syzbot <syzbot+c27475eb921c46bbdc62@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, hch@....de, jack@...e.com, jack@...e.cz,
        linkinjeon@...il.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: [syzbot] [udf?] BUG: unable to handle kernel NULL pointer
 dereference in __writepage

syzbot has bisected this issue to:

commit 36273e5b4e3a934c6d346c8f0b16b97e018094af
Author: Christoph Hellwig <hch@....de>
Date:   Sun Nov 13 16:29:02 2022 +0000

    udf: remove ->writepage

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15176e66480000
start commit:   77856d911a8c Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17176e66480000
console output: https://syzkaller.appspot.com/x/log.txt?x=13176e66480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=55043d38f21f0e0f
dashboard link: https://syzkaller.appspot.com/bug?extid=c27475eb921c46bbdc62
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141da6e7880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17d81b8b880000

Reported-by: syzbot+c27475eb921c46bbdc62@...kaller.appspotmail.com
Fixes: 36273e5b4e3a ("udf: remove ->writepage")

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