From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756278Ab3LVUqu (ORCPT ); Sun, 22 Dec 2013 15:46:50 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:39916 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755210Ab3LVUqt (ORCPT ); Sun, 22 Dec 2013 15:46:49 -0500 Message-ID: <52B74FB1.7070306@oracle.com> Date: Sun, 22 Dec 2013 15:46:41 -0500 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Greg KH , Tejun Heo CC: LKML Subject: kernfs: WARNING: CPU: 59 PID: 10414 at lib/debugobjects.c:260 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, While fuzzing with trinity inside a KVM tools guest running latest -next kernel, I've stumbled on the following spew. Beyond regular trinity fuzzing, the machine was in the middle of attempting to offline all of it's cpus (64 of them). [ 645.148744] WARNING: CPU: 59 PID: 10414 at lib/debugobjects.c:260 debug_print_object +0x8d/0xb0() [ 645.150844] ODEBUG: free active (active state 0) object type: timer_list hint: delay ed_work_timer_fn+0x0/0x20 [ 645.152178] Modules linked in: [ 645.152699] CPU: 59 PID: 10414 Comm: sh Tainted: G W 3.13.0-rc4-next-20131 220-sasha-00013-gf9a57f1-dirty #6 [ 645.154113] 0000000000000104 ffff88001a74fa68 ffffffff845d3d3c ffffffff858006ee [ 645.155294] ffff88001a74fab8 ffff88001a74faa8 ffffffff8112f93c ffff88001a74fad8 [ 645.155294] ffffffff8594fab2 ffff880168f10a10 ffffffff86068c00 ffffffff8891eaf8 [ 645.157180] Call Trace: [ 645.157697] [] dump_stack+0x52/0x7f [ 645.157975] [] warn_slowpath_common+0x8c/0xc0 [ 645.158744] [] warn_slowpath_fmt+0x46/0x50 [ 645.158744] [] debug_print_object+0x8d/0xb0 [ 645.158744] [] ? __queue_work+0x3f0/0x3f0 [ 645.158744] [] __debug_check_no_obj_freed+0xa5/0x220 [ 645.158744] [] ? cpuid4_cache_sysfs_exit+0x46/0xc0 [ 645.158744] [] ? cpuid4_cache_sysfs_exit+0x46/0xc0 [ 645.158744] [] debug_check_no_obj_freed+0x15/0x20 [ 645.158744] [] kfree+0x21f/0x2e0 [ 645.158744] [] cpuid4_cache_sysfs_exit+0x46/0xc0 [ 645.158744] [] cache_remove_dev+0x11a/0x130 [ 645.158744] [] cacheinfo_cpu_callback+0x78/0x90 [ 645.158744] [] notifier_call_chain+0xee/0x130 [ 645.158744] [] __raw_notifier_call_chain+0xe/0x10 [ 645.158744] [] __cpu_notify+0x20/0x40 [ 645.158744] [] cpu_notify_nofail+0x15/0x30 [ 645.158744] [] _cpu_down+0x195/0x2e0 [ 645.158744] [] ? cpu_maps_update_begin+0x17/0x20 [ 645.158744] [] ? device_offline+0x55/0xd0 [ 645.158744] [] ? klist_next+0xf5/0x120 [ 645.158744] [] ? mutex_trylock+0x1fd/0x270 [ 645.158744] [] cpu_down+0x36/0x50 [ 645.158744] [] cpu_subsys_offline+0x14/0x20 [ 645.158744] [] device_offline+0x82/0xd0 [ 645.158744] [] online_store+0x58/0x80 [ 645.158744] [] dev_attr_store+0x20/0x30 [ 645.158744] [] sysfs_kf_write+0x4f/0x70 [ 645.158744] [] kernfs_fop_write+0xdb/0x140 [ 645.158744] [] vfs_write+0xf3/0x1e0 [ 645.158744] [] SyS_write+0x62/0xa0 [ 645.158744] [] tracesys+0xdd/0xe2 Thanks, Sasha