From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@bugzilla.kernel.org Subject: [Bug 44731] ext4 deadlock under heavy io? Date: Mon, 16 Jul 2012 20:54:14 +0000 (UTC) Message-ID: <20120716205414.B3E7511FB37@bugzilla.kernel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" To: linux-ext4@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.19.201]:34667 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753794Ab2GPUyS (ORCPT ); Mon, 16 Jul 2012 16:54:18 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3FAF120253 for ; Mon, 16 Jul 2012 20:54:17 +0000 (UTC) Received: from bugzilla.kernel.org (unknown [198.145.19.217]) by mail.kernel.org (Postfix) with ESMTP id 77FC52024E for ; Mon, 16 Jul 2012 20:54:15 +0000 (UTC) In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: https://bugzilla.kernel.org/show_bug.cgi?id=44731 --- Comment #2 from Anssi Hannula 2012-07-16 20:54:14 --- Created an attachment (id=75501) --> (https://bugzilla.kernel.org/attachment.cgi?id=75501) sysrq-w output on 3.4.2 with frozen filesystem dm-4 I'm seeing a very similar issue on 3.4.2. I think this issue didn't exist several major versions back. When one or more applications do intensive I/O, the filesystem freezes and all processes trying to access it freeze as well. It doesn't always happen in the same way, though. Sometimes I get the "task blocked for more than 120 seconds", but sometimes I don't (in the attached case I didn't get those). Also, sometimes the system becomes usable again after several minutes of being seemingly frozen, but often it doesn't recover (like in the attached case). If wanted, I can provide more logs of these different situations (the logs do look very similar than the ones on this report, though). In the attachment the frozen fs is dm-4. It is on the same LVM VG and RAID-6 as dm-3, dm-5, dm-6, and those other filesystems continued to work while dm-4 was frozen. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug.