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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 AC96AC2D0EC for ; Fri, 10 Apr 2020 04:00:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8609920936 for ; Fri, 10 Apr 2020 04:00:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586491252; bh=HfNeRFiC2zUx8WJjFYhP6dY0KTPulHcHSfWzbYvafII=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Cv+ph9fRPcrx98QLM6CTcVzuqY4bCkOtLnp25fXUvlUecR160p6YSQQVQLPkDeOyW gsYtWttTwaFnjQTIrv401NHxQwnrq+KxWAyUoefdYihjhGlV49PbjT1OC1iHcgHPeU 2PM9jBoumx7vyTVtiClew3DN6U96n9C5AOgOcELw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727867AbgDJDrp (ORCPT ); Thu, 9 Apr 2020 23:47:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:58740 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727859AbgDJDrp (ORCPT ); Thu, 9 Apr 2020 23:47:45 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A68E920936; Fri, 10 Apr 2020 03:47:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586490465; bh=HfNeRFiC2zUx8WJjFYhP6dY0KTPulHcHSfWzbYvafII=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bUn1C2dzujcCm/uQR7nD9tMD8ehInaC2s8E8qHwQNH3KM3c5zy92uVmZPeiBkKq03 fcV7CUPeSTCXohVe7ZF76VtN1F15Vpuft0EPJ0Z5rveYwLFvHGi7mmowuaETstzQuF psE8DDI7UNl54fjhOFE4PDA72ph66S9JAlIGNn9c= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guoqing Jiang , Song Liu , Sasha Levin , linux-raid@vger.kernel.org Subject: [PATCH AUTOSEL 5.6 58/68] md: check arrays is suspended in mddev_detach before call quiesce operations Date: Thu, 9 Apr 2020 23:46:23 -0400 Message-Id: <20200410034634.7731-58-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200410034634.7731-1-sashal@kernel.org> References: <20200410034634.7731-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Guoqing Jiang [ Upstream commit 6b40bec3b13278d21fa6c1ae7a0bdf2e550eed5f ] Don't call quiesce(1) and quiesce(0) if array is already suspended, otherwise in level_store, the array is writable after mddev_detach in below part though the intention is to make array writable after resume. mddev_suspend(mddev); mddev_detach(mddev); ... mddev_resume(mddev); And it also causes calltrace as follows in [1]. [48005.653834] WARNING: CPU: 1 PID: 45380 at kernel/kthread.c:510 kthread_park+0x77/0x90 [...] [48005.653976] CPU: 1 PID: 45380 Comm: mdadm Tainted: G OE 5.4.10-arch1-1 #1 [48005.653979] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J4105-ITX, BIOS P1.40 08/06/2018 [48005.653984] RIP: 0010:kthread_park+0x77/0x90 [48005.654015] Call Trace: [48005.654039] r5l_quiesce+0x3c/0x70 [raid456] [48005.654052] raid5_quiesce+0x228/0x2e0 [raid456] [48005.654073] mddev_detach+0x30/0x70 [md_mod] [48005.654090] level_store+0x202/0x670 [md_mod] [48005.654099] ? security_capable+0x40/0x60 [48005.654114] md_attr_store+0x7b/0xc0 [md_mod] [48005.654123] kernfs_fop_write+0xce/0x1b0 [48005.654132] vfs_write+0xb6/0x1a0 [48005.654138] ksys_write+0x67/0xe0 [48005.654146] do_syscall_64+0x4e/0x140 [48005.654155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [48005.654161] RIP: 0033:0x7fa0c8737497 [1]: https://bugzilla.kernel.org/show_bug.cgi?id=206161 Signed-off-by: Guoqing Jiang Signed-off-by: Song Liu Signed-off-by: Sasha Levin --- drivers/md/md.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 469f551863bea..0b30ada971c14 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6184,7 +6184,7 @@ EXPORT_SYMBOL_GPL(md_stop_writes); static void mddev_detach(struct mddev *mddev) { md_bitmap_wait_behind_writes(mddev); - if (mddev->pers && mddev->pers->quiesce) { + if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } -- 2.20.1