From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: netfilter: active obj WARN when cleaning up Date: Sat, 07 Sep 2013 09:10:13 -0400 Message-ID: <522B25B5.6000808@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, LKML To: pablo@netfilter.org, kaber@trash.net, kadlec@blackhole.kfki.hu, "David S. Miller" Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netfilter-devel.vger.kernel.org Hi all, While fuzzing with trinity inside a KVM tools guest, running latest -next kernel, I've stumbled on the following: [ 418.311956] ------------[ cut here ]------------ [ 418.312449] WARNING: CPU: 6 PID: 4178 at lib/debugobjects.c:260 debug_print_object+0x8d/0xb0() [ 418.313243] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x20 [ 418.314038] Modules linked in: [ 418.314038] CPU: 6 PID: 4178 Comm: kworker/u16:2 Tainted: G W 3.11.0-next-20130906-sasha #3984 [ 418.314038] Workqueue: netns cleanup_net [ 418.314038] 0000000000000104 ffff880410371a58 ffffffff841b7815 0000000000000104 [ 418.314038] ffff880410371aa8 ffff880410371a98 ffffffff8112540c ffff880410371a78 [ 418.314038] ffffffff853ea0ab ffff8800bdc68b80 ffffffff85a65c00 ffffffff87676658 [ 418.314038] Call Trace: [ 418.314038] [] dump_stack+0x52/0x87 [ 418.320315] [] warn_slowpath_common+0x8c/0xc0 [ 418.321040] [] warn_slowpath_fmt+0x46/0x50 [ 418.321101] [] debug_print_object+0x8d/0xb0 [ 418.321101] [] ? __queue_work+0x390/0x390 [ 418.321101] [] __debug_check_no_obj_freed+0xa5/0x220 [ 418.321101] [] ? kmem_cache_destroy+0x86/0xe0 [ 418.321101] [] debug_check_no_obj_freed+0x15/0x20 [ 418.321101] [] kmem_cache_free+0x197/0x340 [ 418.321101] [] kmem_cache_destroy+0x86/0xe0 [ 418.321101] [] nf_conntrack_cleanup_net_list+0x131/0x170 [ 418.321101] [] nf_conntrack_pernet_exit+0x5d/0x70 [ 418.321101] [] ops_exit_list+0x5e/0x70 [ 418.321101] [] cleanup_net+0xfb/0x1c0 [ 418.321101] [] process_one_work+0x338/0x550 [ 418.321101] [] ? process_one_work+0x260/0x550 [ 418.321883] [] worker_thread+0x215/0x350 [ 418.321883] [] ? manage_workers+0x180/0x180 [ 418.321883] [] kthread+0xe7/0xf0 [ 418.321883] [] ? __init_kthread_worker+0x70/0x70 [ 418.321883] [] ret_from_fork+0x7c/0xb0 [ 418.321883] [] ? __init_kthread_worker+0x70/0x70 [ 418.321883] ---[ end trace c974221542b61d0d ]--- Thanks, Sasha