From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755743Ab2KUTMv (ORCPT ); Wed, 21 Nov 2012 14:12:51 -0500 Received: from gmmr5.centrum.cz ([46.255.225.250]:59156 "EHLO gmmr5.centrum.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755720Ab2KUTMu (ORCPT ); Wed, 21 Nov 2012 14:12:50 -0500 X-Greylist: delayed 640 seconds by postgrey-1.27 at vger.kernel.org; Wed, 21 Nov 2012 14:12:50 EST To: Subject: =?utf-8?q?memory=2Dcgroup_bug?= Date: Wed, 21 Nov 2012 20:02:07 +0100 From: "azurIt" X-Mailer: Centrum Email 5.3 X-Priority: 3 X-Original-From: azurit@pobox.sk MIME-Version: 1.0 Message-Id: <20121121200207.01068046@pobox.sk> X-Maser: oho Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, i'm using memory cgroup for limiting our users and having a really strange problem when a cgroup gets out of its memory limit. It's very strange because it happens only sometimes (about once per week on random user), out of memory is usually handled ok. This happens when problem occures: - no new processes can be started for this cgroup - current processes are freezed and taking 100% of CPU - when i try to 'strace' any of current processes, the whole strace freezes until process is killed (strace cannot be terminated by CTRL-c) - problem can be resolved by raising memory limit for cgroup or killing of few processes inside cgroup so some memory is freed I also garbbed the content of /proc//stack of freezed process: [] mem_cgroup_handle_oom+0x241/0x3b0 [] T.1146+0x5ab/0x5c0 [] mem_cgroup_charge_common+0x56/0xa0 [] mem_cgroup_newpage_charge+0x45/0x50 [] do_wp_page+0x14e/0x800 [] handle_pte_fault+0x264/0x940 [] handle_mm_fault+0x138/0x260 [] do_page_fault+0x13d/0x460 [] page_fault+0x1f/0x30 [] 0xffffffffffffffff I'm currently using kernel 3.2.34 but i'm having this problem since 2.6.32. Any ideas? Thnx. azurIt