Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752844AbaBTCdZ (ORCPT ); Wed, 19 Feb 2014 21:33:25 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:17848 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752303AbaBTCdX (ORCPT ); Wed, 19 Feb 2014 21:33:23 -0500 Message-ID: <53056959.2070501@huawei.com> Date: Thu, 20 Feb 2014 10:32:57 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Fengguang Wu CC: Tejun Heo , , Cgroups Subject: Re: [cgroup] BUG: unable to handle kernel NULL pointer dereference at 0000001c References: <20140219122537.GD7735@localhost> In-Reply-To: <20140219122537.GD7735@localhost> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.18.230] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014/2/19 20:25, Fengguang Wu wrote: > Greetings, > > I got the below dmesg and the first bad commit is > > git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next > > commit ace2bee8135a3dc725958b8d08c55ee9df813d39 > Author: Tejun Heo > AuthorDate: Tue Feb 11 11:52:47 2014 -0500 > Commit: Tejun Heo > CommitDate: Tue Feb 11 11:52:47 2014 -0500 > > cgroup: introduce cgroup_tree_mutex > > Signed-off-by: Tejun Heo > Acked-by: Li Zefan > Thanks for the report. It was introduced by e61734c55c24cdf11b07e52a74aec4dc4a7f4bd0 cgroup: remove cgroup->name And It has been fixed by cc045e3952175e84c38dad22dea14465b9fc8fb5 cgroup: deal with dummp_top in cgroup_name() and cgroup_path() The fix has been in for-next fox about a week, so I'm curious why you still hit this bug. > [ 97.464167] BUG: unable to handle kernel NULL pointer dereference at 0000001c > [ 97.464897] IP: [<8130f33d>] kernfs_path_locked+0x7d/0xc0 > [ 97.465519] *pde = 00000000 > [ 97.465960] Oops: 0000 [#1] SMP > [ 97.466936] CPU: 0 PID: 24 Comm: kworker/0:1 Tainted: G S W 3.14.0-rc2-01592-g97162c1 #6 > [ 97.467818] Workqueue: events_freezable_power_ disk_events_workfn > [ 97.468342] task: 801c7560 ti: 801d6000 task.ti: 801d6000 > [ 97.468836] EIP: 0060:[<8130f33d>] EFLAGS: 00000046 CPU: 0 > [ 97.469291] EIP is at kernfs_path_locked+0x7d/0xc0 > [ 97.469636] EAX: 00000000 EBX: 00000000 ECX: 801d7c34 EDX: 801d7bb4 > [ 97.470024] ESI: 00000046 EDI: 801d7c33 EBP: 801d7b68 ESP: 801d7b58 > [ 97.470505] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 > [ 97.470929] CR0: 8005003b CR2: 0000001c CR3: 03b92000 CR4: 00300690 > [ 97.471550] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > [ 97.472155] DR6: 00000000 DR7: 00000000 > [ 97.472397] Stack: > [ 97.472397] 801d7bb4 00000000 00000046 801d7bb4 801d7b80 8130fe59 00000080 929c0ce0 > [ 97.472397] 929ae498 00000018 801d7c40 8199b88a 00000002 00000001 00000000 8199b650 > [ 97.472397] 929ae498 00000000 00000001 801c7560 929ae5e4 929b46f8 929c0ca0 819978d0 > [ 97.472397] Call Trace: > [ 97.472397] [<8130fe59>] kernfs_path+0x49/0x80 > [ 97.472397] [<8199b88a>] cfq_find_alloc_queue+0x3fa/0x620 > [ 97.472397] [<8199b650>] ? cfq_find_alloc_queue+0x1c0/0x620 > [ 97.472397] [<819978d0>] ? cfq_put_request+0x220/0x220 > [ 97.472397] [<8199bca5>] ? cfq_set_request+0x85/0x740 > [ 97.472397] [<8111e5ce>] ? do_raw_spin_lock+0xe/0x2e0 > [ 97.472397] [<8199bb35>] cfq_get_queue+0x85/0x170 > [ 97.472397] [<8199bff7>] cfq_set_request+0x3d7/0x740 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/