From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 289A21F17E for ; Wed, 11 Oct 2023 15:02:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.cz header.i=@suse.cz header.b="T9TgFNI9"; dkim=permerror (0-bit key) header.d=suse.cz header.i=@suse.cz header.b="C9D/lfHk" Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA388B8 for ; Wed, 11 Oct 2023 08:02:54 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 3CDEF21846; Wed, 11 Oct 2023 15:02:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1697036573; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=awXeHnzKVNgiS0Fzf1SiO3ohSbJ6lvsHSccL6Y9Lfiw=; b=T9TgFNI9IvH0yoBj/RX6cgvAyEiLl7rJM0FHVLjWXEKyLYj6q8K6vrV9zzBm9z/n2TihIx uQmYaEfLZ2mPfnxbl9lcRy8HOsmutEV/LbFg1O/MVcDq4bZrpt1e2dXYzbXuz1wDyEpZfM c9/c9rHm9MJGSzMDWFMP+SjynFfzXsw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1697036573; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=awXeHnzKVNgiS0Fzf1SiO3ohSbJ6lvsHSccL6Y9Lfiw=; b=C9D/lfHkE5ik/SXYaKWQvUKuq2+tx+9VIONB7S2vVhrgInJqA4agmQVnWHQnZfqmBX84PS ZoXRX81McZClrtDw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 2BEBE13A7A; Wed, 11 Oct 2023 15:02:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 7OCzCh25JmVUfwAAMHmgww (envelope-from ); Wed, 11 Oct 2023 15:02:53 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 8CA1AA05BC; Wed, 11 Oct 2023 17:02:52 +0200 (CEST) From: Jan Kara To: Yury Norov Cc: Andy Shevchenko , Rasmus Villemoes , Mirsad Todorovac , Matthew Wilcox , , Jan Kara Subject: [PATCH 0/2] lib/find: Fix KCSAN warnings in find_*_bit() functions Date: Wed, 11 Oct 2023 17:02:30 +0200 Message-Id: <20231011144320.29201-1-jack@suse.cz> X-Mailer: git-send-email 2.35.3 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=506; i=jack@suse.cz; h=from:subject:message-id; bh=1TMdpQ6RN5svq7kefEVUUKEJS/qQcpAhqNC3wezb0+A=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBlJrj/zZWF7VQtk/I4WScNts1+yKOPtp3PKyM8ahsv rpGDqguJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZSa4/wAKCRCcnaoHP2RA2U7BCA CoTyRn1ja1GE0IAz9Fle4g7iO5elazQbrBa+YUx+gmb4MoyOyzFg7Mw/7/gu3N02GQXiLwrLILFFNq DK8yXoPSSqaYhWo5IvMBINe5sk5RJRXU1gY8Eo+ZL03cB/oLi7VEISbadShvbnZN+7riBCEKuatpdF 87qxmCshQTZyruH6slaqBTm6E5yL5/kmtYPUkpDyIh9ro9ZXAWnFl45LhBklyK8iTOuj+D98r3Xur4 29r6QI+WdEVD44OZnWZsUKC/Mnl6BhLvni/oAb7ZRK+2DKLvYuP4Za17Shw8cb/Nx9RKbuJ3B81VsC 4e2BL9Y7sz4UptKKdHi5GX3yoc3hbq X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Content-Transfer-Encoding: 8bit Authentication-Results: smtp-out1.suse.de; none X-Spam-Score: 6.40 X-Spamd-Result: default: False [6.40 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; BAYES_SPAM(0.00)[22.07%]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_MISSING_CHARSET(2.50)[]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; BROKEN_CONTENT_TYPE(1.50)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; RCPT_COUNT_SEVEN(0.00)[7]; MID_CONTAINS_FROM(1.00)[]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; SUSPICIOUS_RECIPS(1.50)[] X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_SOFTFAIL,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Hello, KCSAN issues a lot of warnings for various find_*_bit() functions. This is because some users (such as xarray) use these functions without protection from concurrent modifications (e.g. xarray tag searching is protected only by RCU) and find_*_bit() implementations are indeed prone to refetching values from memory with undefined results. This series fixes these problems. See patch 1 for more details. Mirsad, can you give these patches testing on your setup? Thanks! Honza