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Tue, 30 Jul 2024 14:16:57 +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 Sc8FFNn1qGZ7aQAAD6G6ig (envelope-from ); Tue, 30 Jul 2024 14:16:57 +0000 Date: Tue, 30 Jul 2024 16:16:56 +0200 From: David Sterba To: syzbot Cc: clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [btrfs?] INFO: trying to register non-static key in btrfs_stop_all_workers Message-ID: <20240730141656.GD17473@twin.jikos.cz> Reply-To: dsterba@suse.cz References: <000000000000de6b81061a5938d6@google.com> Precedence: bulk X-Mailing-List: linux-btrfs@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: <000000000000de6b81061a5938d6@google.com> User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) X-Spamd-Result: default: False [-1.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; SUSPICIOUS_RECIPS(1.50)[]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=998c63c06e77f5e7]; NEURAL_HAM_LONG(-1.00)[-1.000]; HAS_REPLYTO(0.30)[dsterba@suse.cz]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_SEVEN(0.00)[7]; TAGGED_RCPT(0.00)[8e86db7d430e87415248]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; REPLYTO_ADDR_EQ_FROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; SUBJECT_HAS_QUESTION(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -1.30 On Fri, Jun 07, 2024 at 09:19:28PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: f06ce441457d Merge tag 'loongarch-fixes-6.10-1' of git://g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=176b7026980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=998c63c06e77f5e7 > dashboard link: https://syzkaller.appspot.com/bug?extid=8e86db7d430e87415248 > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. Most likely this was a side effect of bug fixed by commit f3a5367c679d ("btrfs: protect folio::private when attaching extent buffer folios"). There's only one syzbot report and the timeframe corresponds with increased number of bogus errors caused by use-after-free of a page. The fix is best guess. #syz fix: btrfs: protect folio::private when attaching extent buffer folios