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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 79A63C352BE for ; Thu, 16 Apr 2020 13:28:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B67E21D93 for ; Thu, 16 Apr 2020 13:28:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587043700; bh=qyNAzDbbtWFnkhRRYXh9FLygVhphQoMWEjbxwYbL6Go=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kGuWbibq/P7+Cq/OIOekUyFu0Vg6P9hHYI8FzhtJhpL9EhEU6BdayMaqUbtq47NSz WG/T9ILvCShjt9SAMH5oh6L6YtiKSuu/0tmptVp+ITFkri3A7QH4ngTlYgeXCPjHjh lrf/j1cmMBUMAPpzLzH/vXqTT51WcpNparxB+oDo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2895704AbgDPN2P (ORCPT ); Thu, 16 Apr 2020 09:28:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:37098 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2895703AbgDPN2N (ORCPT ); Thu, 16 Apr 2020 09:28:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B443B21D79; Thu, 16 Apr 2020 13:28:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587043693; bh=qyNAzDbbtWFnkhRRYXh9FLygVhphQoMWEjbxwYbL6Go=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fc8p4vPps+1hxaoscQcv6bTRVlPdO1vzyNGhdKCedli5uHocIFtS4X0HcMnksGZjv WEIzTLe97zLNnwNN4l5WRrPSHYMsUyARPm0QJbHN2YB3Q0vzc7pwfoT0wuj0y6Hx5f 7DCv/DxF91KjawBPEt217PD9Q4HscBpCOBIjfwpc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Guoqing Jiang , Song Liu , Sasha Levin Subject: [PATCH 4.19 034/146] md: check arrays is suspended in mddev_detach before call quiesce operations Date: Thu, 16 Apr 2020 15:22:55 +0200 Message-Id: <20200416131247.165074291@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131242.353444678@linuxfoundation.org> References: <20200416131242.353444678@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 62f214d43e15a..9426976e0860d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5874,7 +5874,7 @@ 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