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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2CFB9EB64DC for ; Wed, 28 Jun 2023 01:09:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230063AbjF1BI5 (ORCPT ); Tue, 27 Jun 2023 21:08:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229593AbjF1BIy (ORCPT ); Tue, 27 Jun 2023 21:08:54 -0400 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B60E9E5B; Tue, 27 Jun 2023 18:08:52 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4QrNkl30ctz4f3l26; Wed, 28 Jun 2023 09:08:47 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP4 (Coremail) with SMTP id gCh0CgAHuKsfiJtk9u_GMg--.34640S4; Wed, 28 Jun 2023 09:08:49 +0800 (CST) From: Yu Kuai To: xni@redhat.com, logang@deltatee.com, hch@lst.de, song@kernel.org, shli@fb.com Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawwe.com Subject: [PATCH -next v2 0/2] md/raid5-cache: fix a deadlock in r5l_exit_log() Date: Wed, 28 Jun 2023 09:07:54 +0800 Message-Id: <20230628010756.70649-1-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: gCh0CgAHuKsfiJtk9u_GMg--.34640S4 X-Coremail-Antispam: 1UD129KBjvdXoW7Wr45JF43Kw1UJFW5XF4DCFg_yoWftrcEqF y8WF98Gw1rAF1akas5Cr1xGr97KrW8ZF4rtFy8tFWa9Fy3Xr1Fkr48Gr4rWa9xWFWDuF13 CrW8JFW8JrnFgjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbxkFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j 6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628v n2kIc2xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F4 0E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFyl IxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxV AFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6rW3Jr0E3s1lIxAIcVC2z280aVAFwI0_ Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7VUb XdbUUUUUU== X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org From: Yu Kuai Changes in v2: - remove a now unused local variable in patch 2; Commit b13015af94cf ("md/raid5-cache: Clear conf->log after finishing work") introduce a new problem: // caller hold reconfig_mutex r5l_exit_log flush_work(&log->disable_writeback_work) r5c_disable_writeback_async wait_event /* * conf->log is not NULL, and mddev_trylock() * will fail, wait_event() can never pass. */ conf->log = NULL patch 1 revert this patch, an patch 2 fix the original problem in a different way. Noted this problem is just found by code review, and I think this is probably the reason that some mdadm tests is broken. Yu Kuai (2): md/raid5-cache: Revert "md/raid5-cache: Clear conf->log after finishing work" md/raid5-cache: fix null-ptr-deref in r5l_reclaim_thread() drivers/md/raid5-cache.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-) -- 2.39.2