From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54DD8C11F66 for ; Mon, 5 Jul 2021 15:29:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 428A861176 for ; Mon, 5 Jul 2021 15:29:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232310AbhGEPcD (ORCPT ); Mon, 5 Jul 2021 11:32:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:56354 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232091AbhGEPbe (ORCPT ); Mon, 5 Jul 2021 11:31:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DA00661999; Mon, 5 Jul 2021 15:28:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625498933; bh=hEXybyKNzNQh9GIrfXSwiHb+N8bB+QE1nn7cGPVvTAw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j6LKAHP6n0wILXxxFk22Z3GRXj/WwBulBAlc7wDTIgIRHuKyer7HtDUrfLQPcFv0D klBsz12bfrXqIbeEgFKVoFVKQbkTp83rRB2nURzqdZ89M+hG2HT2bvoLaU8uUGKmMT 7IohRprSdN+uF/AvpnRg5CopBanWSzlhImTQh3zo2ssXt85FROsJ2mkPbmx3/xCq7z qm3hr+T1lRk/kVGx3e43wIJkMAFgfoyxlTSIlD7mv+o5bV3vH7PE92tlPe0ZCSBSvF HFYLxQKI+BC8i4Ra/iK4th88gC+OuO1i/GVQhZrmTW/7UABnb4rGipBA2bewVt6D86 m6qU5aeeteisA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ming Lei , Yi Zhang , Bart Van Assche , Jens Axboe , Sasha Levin , linux-block@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 29/59] block: fix race between adding/removing rq qos and normal IO Date: Mon, 5 Jul 2021 11:27:45 -0400 Message-Id: <20210705152815.1520546-29-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210705152815.1520546-1-sashal@kernel.org> References: <20210705152815.1520546-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ming Lei [ Upstream commit 2cafe29a8d03f02a3d16193bdaae2f3e82a423f9 ] Yi reported several kernel panics on: [16687.001777] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008 ... [16687.163549] pc : __rq_qos_track+0x38/0x60 or [ 997.690455] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ... [ 997.850347] pc : __rq_qos_done+0x2c/0x50 Turns out it is caused by race between adding rq qos(wbt) and normal IO because rq_qos_add can be run when IO is being submitted, fix this issue by freezing queue before adding/deleting rq qos to queue. rq_qos_exit() needn't to freeze queue because it is called after queue has been frozen. iolatency calls rq_qos_add() during allocating queue, so freezing won't add delay because queue usage refcount works at atomic mode at that time. iocost calls rq_qos_add() when writing cgroup attribute file, that is fine to freeze queue at that time since we usually freeze queue when storing to queue sysfs attribute, meantime iocost only exists on the root cgroup. wbt_init calls it in blk_register_queue() and queue sysfs attribute store(queue_wb_lat_store() when write it 1st time in case of !BLK_WBT_MQ), the following patch will speedup the queue freezing in wbt_init. Reported-by: Yi Zhang Cc: Bart Van Assche Signed-off-by: Ming Lei Reviewed-by: Bart Van Assche Tested-by: Yi Zhang Link: https://lore.kernel.org/r/20210609015822.103433-2-ming.lei@redhat.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-rq-qos.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h index 2bc43e94f4c4..2bcb3495e376 100644 --- a/block/blk-rq-qos.h +++ b/block/blk-rq-qos.h @@ -7,6 +7,7 @@ #include #include #include +#include #include "blk-mq-debugfs.h" @@ -99,8 +100,21 @@ static inline void rq_wait_init(struct rq_wait *rq_wait) static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos) { + /* + * No IO can be in-flight when adding rqos, so freeze queue, which + * is fine since we only support rq_qos for blk-mq queue. + * + * Reuse ->queue_lock for protecting against other concurrent + * rq_qos adding/deleting + */ + blk_mq_freeze_queue(q); + + spin_lock_irq(&q->queue_lock); rqos->next = q->rq_qos; q->rq_qos = rqos; + spin_unlock_irq(&q->queue_lock); + + blk_mq_unfreeze_queue(q); if (rqos->ops->debugfs_attrs) blk_mq_debugfs_register_rqos(rqos); @@ -110,12 +124,22 @@ static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos) { struct rq_qos **cur; + /* + * See comment in rq_qos_add() about freezing queue & using + * ->queue_lock. + */ + blk_mq_freeze_queue(q); + + spin_lock_irq(&q->queue_lock); for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) { if (*cur == rqos) { *cur = rqos->next; break; } } + spin_unlock_irq(&q->queue_lock); + + blk_mq_unfreeze_queue(q); blk_mq_debugfs_unregister_rqos(rqos); } -- 2.30.2