From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7694512D200; Wed, 27 Mar 2024 11:57:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711540643; cv=none; b=Smq0ykjz7tvNE1QzxmPFqj45lLyTEFTZ7tITxGiKKemDLOo7dsie5FbJfkpIWlyQoZz0swJEQw2LLgrvbLre0MZsTKraGiFpTz0iTM+sjId8bzkUOJheKDFJLNU/hIfyjIIcLb1GooJE9hpd1vcN+oscMWISdtci65DqWybza64= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711540643; c=relaxed/simple; bh=Z72P05lRn/ftrZ8xPXWCX7i9zWc1Pei+lnW/yl70jIc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ZqMuXqJIeANwPA85nnnW5zy78m9AUFqNPxdjwesvjO5mzNcEd7wzDvFXu9Mk0gngHChEGMQoSN9oxUrrymBPfsXmU3uCfw8Nxi1ybUFyUc3kBLj1cNKtnsJCL/k8fBDTSWrqObeRP6B1tkPf+gVCdSOXjIVYz+flqjJBdGNcEr4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VSqybJPW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VSqybJPW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88BABC433C7; Wed, 27 Mar 2024 11:57:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711540643; bh=Z72P05lRn/ftrZ8xPXWCX7i9zWc1Pei+lnW/yl70jIc=; h=From:To:Cc:Subject:Date:Reply-To:From; b=VSqybJPWwiIXFHUM3hR8t+68Su4uByFakymM8HVC3sdAbzTl3z7nzzIIMhV663J44 e5Rp/FPxL5VTLpREPPvrMRUesUuGhBXhKDgsBwDlqYsZNQu2IT73gwra+JqjaMmRFw yRUTEeAIAVT1zvcoSF7SYylT/MFHJaQDRxH1FWn3RrmrOIDZk6qpI8iukaRzqtd4zR jTQUqDg+yOcs7/71hshH8aSijjKsKQ4xZtdpcQN2OccPtQfP3x/e7WcXmUt9X6FlBP RmGGIoieaOJsTxbDc3KeZOPniIj4bj7eiHMnnmafy1qMi5+GCyS6b95y0BqmHBet7l q9+SeU9T2J78g== From: Sasha Levin To: stable-commits@vger.kernel.org, yukuai3@huawei.com Cc: Alasdair Kergon , Mike Snitzer , Mikulas Patocka , dm-devel@lists.linux.dev Subject: Patch "dm-raid: fix lockdep waring in "pers->hot_add_disk"" has been added to the 4.19-stable tree Date: Wed, 27 Mar 2024 07:57:21 -0400 Message-ID: <20240327115721.2822756-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Reply-To: stable@vger.kernel.org Content-Transfer-Encoding: 8bit This is a note to let you know that I've just added the patch titled dm-raid: fix lockdep waring in "pers->hot_add_disk" to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: dm-raid-fix-lockdep-waring-in-pers-hot_add_disk.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. commit 1b3818962a987bdc835b4603c3028f209b754aa5 Author: Yu Kuai Date: Tue Mar 5 15:23:06 2024 +0800 dm-raid: fix lockdep waring in "pers->hot_add_disk" [ Upstream commit 95009ae904b1e9dca8db6f649f2d7c18a6e42c75 ] The lockdep assert is added by commit a448af25becf ("md/raid10: remove rcu protection to access rdev from conf") in print_conf(). And I didn't notice that dm-raid is calling "pers->hot_add_disk" without holding 'reconfig_mutex'. "pers->hot_add_disk" read and write many fields that is protected by 'reconfig_mutex', and raid_resume() already grab the lock in other contex. Hence fix this problem by protecting "pers->host_add_disk" with the lock. Fixes: 9092c02d9435 ("DM RAID: Add ability to restore transiently failed devices on resume") Fixes: a448af25becf ("md/raid10: remove rcu protection to access rdev from conf") Cc: stable@vger.kernel.org # v6.7+ Signed-off-by: Yu Kuai Signed-off-by: Xiao Ni Acked-by: Mike Snitzer Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20240305072306.2562024-10-yukuai1@huaweicloud.com Signed-off-by: Sasha Levin diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 1759134fce824..2a8746f9c6d87 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -4023,7 +4023,9 @@ static void raid_resume(struct dm_target *ti) * Take this opportunity to check whether any failed * devices are reachable again. */ + mddev_lock_nointr(mddev); attempt_restore_of_faulty_devices(rs); + mddev_unlock(mddev); } if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {