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Fri, 21 Jun 2024 16:09:42 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 2LUGKMaldWYfTAAAD6G6ig (envelope-from ); Fri, 21 Jun 2024 16:09:42 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 4433EA085C; Fri, 21 Jun 2024 18:09:42 +0200 (CEST) Date: Fri, 21 Jun 2024 18:09:42 +0200 From: Jan Kara To: syzbot Cc: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Subject: Re: [syzbot] kernel BUG in ext4_do_writepages Message-ID: <20240621160942.4bfi56fgy6ycvtl4@quack3> References: <0000000000006fd14305f00bdc84@google.com> <0000000000000b3e69061b5b5762@google.com> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000000b3e69061b5b5762@google.com> X-Spam-Score: -2.30 X-Spam-Level: X-Spam-Flag: NO X-Spamd-Result: default: False [-2.30 / 50.00]; BAYES_HAM(-3.00)[99.98%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MISSING_XM_UA(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[d1da16f03614058fdc48]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; RCVD_TLS_LAST(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,imap1.dmz-prg2.suse.org:helo] On Thu 20-06-24 17:16:16, syzbot wrote: > This bug is marked as fixed by commit: > ext4: fix race condition between buffer write and page_mkwrite > > But I can't find it in the tested trees[1] for more than 90 days. > Is it a correct commit? Please update it by replying: > > #syz fix: exact-commit-title > > Until then the bug is still considered open and new crashes with > the same signature are ignored. > > Kernel: Linux > Dashboard link: https://syzkaller.appspot.com/bug?extid=d1da16f03614058fdc48 This bug is still unfixed AFAIK as we realized the fixing commit is buggy and there's no easy fix (inline_data feature has some difficult to address problems). So can we 'syz unfix' this? :) Honza -- Jan Kara SUSE Labs, CR