Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753275AbaBJTTr (ORCPT ); Mon, 10 Feb 2014 14:19:47 -0500 Received: from mail-vb0-f50.google.com ([209.85.212.50]:56207 "EHLO mail-vb0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752453AbaBJTTo (ORCPT ); Mon, 10 Feb 2014 14:19:44 -0500 MIME-Version: 1.0 Date: Mon, 10 Feb 2014 21:19:43 +0200 Message-ID: Subject: lockdep: strange %s#5 lock name From: Tommi Rantala To: Peter Zijlstra , Ingo Molnar Cc: LKML , Dave Jones , trinity@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Noticed a suspicious "%s#5" lock name in a lockdep splat while fuzzing with trinity. Tommi [249844.491141] INFO: task kworker/u2:2:32113 blocked for more than 120 seconds. [249844.493268] Not tainted v3.13-11268-g8a1f006 #3 [249844.494731] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [249844.496922] kworker/u2:2 D ffff880074a92520 0 32113 2 0x00000000 [249844.498985] Workqueue: netns cleanup_net [249844.500188] ffff8800956d1c78 0000000000000046 ffff880074a92520 00000000001d4f80 [249844.502360] ffff8800956d1fd8 00000000001d4f80 ffff880074a90000 ffff880074a92520 [249844.504617] ffff8800b414dab8 ffffffff82db4d20 ffffffff82db4d28 0000000000000246 [249844.506647] Call Trace: [249844.507331] [] schedule+0x65/0x70 [249844.508576] [] schedule_preempt_disabled+0x11/0x20 [249844.510185] [] mutex_lock_nested+0x285/0x4a0 [249844.511777] [] ? cleanup_net+0x80/0x1e0 [249844.513422] [] ? cleanup_net+0x80/0x1e0 [249844.514998] [] cleanup_net+0x80/0x1e0 [249844.516523] [] process_one_work+0x366/0x690 [249844.518172] [] ? process_one_work+0x240/0x690 [249844.519840] [] worker_thread+0x21e/0x370 [249844.521422] [] ? rescuer_thread+0x2c0/0x2c0 [249844.523040] [] kthread+0xf0/0x100 [249844.524425] [] ? finish_task_switch+0x81/0x130 [249844.525987] [] ? insert_kthread_work+0x90/0x90 [249844.527487] [] ret_from_fork+0x7c/0xb0 [249844.528959] [] ? insert_kthread_work+0x90/0x90 [249844.530451] 3 locks held by kworker/u2:2/32113: [249844.531638] #0: (%s#5){.+.+.+}, at: [] process_one_work+0x240/0x690 [249844.533891] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x240/0x690 [249844.536317] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x80/0x1e0 [249844.538744] INFO: task trinity-c10:23911 blocked for more than 120 seconds. [249844.540723] Not tainted v3.13-11268-g8a1f006 #3 [249844.542192] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [249844.544785] trinity-c10 D ffff8800b963a520 0 23911 22465 0x00000004 [249844.546929] ffff880020d49df8 0000000000000046 ffff8800b963a520 00000000001d4f80 [249844.549183] ffff880020d49fd8 00000000001d4f80 ffff8800bb42a520 ffff8800b963a520 [249844.551401] ffff880024e58000 ffffffff82db4d20 ffffffff82db4d28 0000000000000246 [249844.553376] Call Trace: [249844.553998] [] schedule+0x65/0x70 [249844.555237] [] schedule_preempt_disabled+0x11/0x20 [249844.556844] [] mutex_lock_nested+0x285/0x4a0 [249844.558349] [] ? copy_net_ns+0x97/0x150 [249844.559748] [] ? copy_net_ns+0x97/0x150 [249844.561305] [] copy_net_ns+0x97/0x150 [249844.562789] [] create_new_namespaces+0x126/0x1c0 [249844.564551] [] ? ip_build_and_send_pkt+0x1cd/0x260 [249844.566484] [] unshare_nsproxy_namespaces+0xa7/0xe0 [249844.568325] [] SyS_unshare+0x116/0x2c0 [249844.569838] [] ? ip_build_and_send_pkt+0x1cd/0x260 [249844.571664] [] system_call_fastpath+0x16/0x1b [249844.573328] [] ? ip_build_and_send_pkt+0x1cd/0x260 [249844.574886] 1 lock held by trinity-c10/23911: [249844.576036] #0: (net_mutex){+.+.+.}, at: [] copy_net_ns+0x97/0x150 -- 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/