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Thu, 19 Jan 2023 08:31:22 -0800 (PST) Date: Thu, 19 Jan 2023 08:31:22 -0800 In-Reply-To: <0000000000003198a505f0076823@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009cfc1705f2a07641@google.com> Subject: Re: [syzbot] [udf?] BUG: unable to handle kernel NULL pointer dereference in __writepage From: syzbot To: akpm@linux-foundation.org, hch@lst.de, jack@suse.com, jack@suse.cz, linkinjeon@gmail.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: pamcu177ux3totqnhney75qmasy7fmiq X-Rspamd-Queue-Id: 157DAA0028 X-HE-Tag: 1674145882-393167 X-HE-Meta: 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 GkxwyZJX 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: syzbot has bisected this issue to: commit 36273e5b4e3a934c6d346c8f0b16b97e018094af Author: Christoph Hellwig 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@syzkaller.appspotmail.com Fixes: 36273e5b4e3a ("udf: remove ->writepage") For information about bisection process see: https://goo.gl/tpsmEJ#bisection