From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756466AbYE3Khu (ORCPT ); Fri, 30 May 2008 06:37:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753089AbYE3Khm (ORCPT ); Fri, 30 May 2008 06:37:42 -0400 Received: from as4.cineca.com ([130.186.84.251]:41016 "EHLO as4.cineca.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753151AbYE3Khl (ORCPT ); Fri, 30 May 2008 06:37:41 -0400 Message-ID: <483FD8E5.2080600@gmail.com> From: Andrea Righi Reply-To: righi.andrea@gmail.com User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070604 Thunderbird/1.5.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 To: Satoshi UCHIDA Cc: "'Ryo Tsuruta'" , axboe@kernel.dk, vtaras@openvz.org, containers@lists.linux-foundation.org, tom-sugawara@ap.jp.nec.com, linux-kernel@vger.kernel.org Subject: Re: [RFC][v2][patch 0/12][CFQ-cgroup]Yet another I/O bandwidth controlling subsystem for CGroups based on CFQ References: <20080513.003316.226782406.ryov@valinux.co.jp> <20080522.220438.226802699.ryov@valinux.co.jp> <003701c8bc80$3a5f9ec0$af1edc40$@jp.nec.com> <20080526.114627.104044752.ryov@valinux.co.jp> <004f01c8bfed$640fa380$2c2eea80$@jp.nec.com> In-Reply-To: <004f01c8bfed$640fa380$2c2eea80$@jp.nec.com> Content-Type: text/plain; charset=iso-2022-jp Content-Transfer-Encoding: 7bit Date: Fri, 30 May 2008 12:37:25 +0200 (MEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Satoshi UCHIDA wrote: > Hi, Tsuruta-san. > >> I'm looking forward to your report. Hi Satoshi, I'm testing your patch agains latest Linus git and I've got the following bug. It can be easily reproduced creating a cgroup, switching the i/o scheduler from cfq to any other and switch back to cfq again. -Andrea BUG: unable to handle kernel paging request at ffffffeb IP: [] cfq_cgroup_sibling_tree_add+0x36/0x90 Oops: 0000 [#1] SMP Modules linked in: i2c_piix4 ne2k_pci 8390 i2c_core Pid: 3543, comm: bash Not tainted (2.6.26-rc4 #1) EIP: 0060:[] EFLAGS: 00010286 CPU: 0 EIP is at cfq_cgroup_sibling_tree_add+0x36/0x90 EAX: 00000003 EBX: c7704c90 ECX: ffffffff EDX: c7102180 ESI: c7102240 EDI: c7704c80 EBP: c7afbe94 ESP: c7afbe80 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process bash (pid: 3543, ti=c7afa000 task=c7aeda00 task.ti=c7afa000) Stack: c7704c90 c71022d0 c7ace078 c7704c80 c71020c0 c7afbea8 c021363c c7ace078 c7803460 c71020c0 c7afbebc c021360a c7102184 c71020c0 c7102180 c7afbee4 c02134e0 00000000 c7102184 c72b8ab0 00000001 c7102140 c72b8ab0 c04b8ac0 Call Trace: [] ? cfq_cgroup_init_cfq_data+0x7c/0x80 [] ? cfq_cgroup_init_cfq_data+0x4a/0x80 [] ? __cfq_cgroup_init_queue+0x100/0x1e0 [] ? cfq_init_queue+0xb/0x10 [] ? elevator_init_queue+0x8/0x10 [] ? elv_iosched_store+0x80/0x2b0 [] ? queue_attr_store+0x49/0x70 [] ? sysfs_write_file+0xbb/0x110 [] ? vfs_write+0x96/0x160 [] ? sysfs_write_file+0x0/0x110 [] ? sys_write+0x3d/0x70 [] ? sysenter_past_esp+0x78/0xd1 ======================= Code: ec 08 8b 82 90 00 00 00 83 e0 fc 89 45 f0 8d 82 90 00 00 00 39 45 f0 75 5f 8d 47 10 89 45 ec 89 c3 31 c0 eb 11 8b 56 7c 8d 41 04 <3b> 51 ec 8d 59 08 0f 43 d8 89 c8 8b 0b 85 c9 75 e9 89 86 90 00 EIP: [] cfq_cgroup_sibling_tree_add+0x36/0x90 SS:ESP 0068:c7afbe80 ---[ end trace 9701f4859bb53d27 ]---