From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756306Ab2ELOHL (ORCPT ); Sat, 12 May 2012 10:07:11 -0400 Received: from pindarots.xs4all.nl ([80.101.128.228]:55574 "EHLO pindarots.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751719Ab2ELOHK (ORCPT ); Sat, 12 May 2012 10:07:10 -0400 X-Greylist: delayed 3511 seconds by postgrey-1.27 at vger.kernel.org; Sat, 12 May 2012 10:07:09 EDT Message-ID: <4FAE60D2.8010308@xs4all.nl> Date: Sat, 12 May 2012 15:08:34 +0200 From: Udo van den Heuvel User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: INFO: rcu_bh detected stall on CPU x (t=0 jiffies) X-Enigmail-Version: 1.4.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, I found a number of these messages in my messages files. They have a format of: 'INFO: rcu_bh detected stall on CPU x (t=0 jiffies)' where 'x' may vary (0-3). This is on an AMD x86_64 box with a kernel.org kernel with minimal patching. I do not yet know of any correlation with other observations of this box. How can we eliminate these stall warnings? Kind regards, Udo May 12 11:45:12 bb3 kernel: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) May 12 11:45:12 bb3 kernel: Pid: 3574, comm: plugin-containe Not tainted 3.3.4 #5 May 12 11:45:12 bb3 kernel: Call Trace: May 12 11:45:12 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 May 12 11:45:12 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 May 12 11:45:12 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 May 12 11:45:12 bb3 kernel: [] ? update_process_times+0x3e/0x80 May 12 11:45:12 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 May 12 11:45:12 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 May 12 11:45:12 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 May 12 11:45:12 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 May 12 11:45:12 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 May 12 11:45:12 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b May 10 16:40:18 bb3 kernel: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) May 10 16:40:18 bb3 kernel: Pid: 12236, comm: plugin-containe Not tainted 3.3.4 #5 May 10 16:40:18 bb3 kernel: Call Trace: May 10 16:40:18 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 May 10 16:40:18 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 May 10 16:40:18 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 May 10 16:40:18 bb3 kernel: [] ? update_process_times+0x3e/0x80 May 10 16:40:18 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 May 10 16:40:18 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 May 10 16:40:18 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 May 10 16:40:18 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 May 10 16:40:18 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 May 10 16:40:18 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b Apr 28 16:54:31 bb3 kernel: INFO: rcu_bh detected stall on CPU 2 (t=0 jiffies) Apr 28 16:54:31 bb3 kernel: Pid: 4939, comm: gnome-shell Not tainted 3.3.4 #4 Apr 28 16:54:31 bb3 kernel: Call Trace: Apr 28 16:54:31 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 Apr 28 16:54:31 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 Apr 28 16:54:31 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 Apr 28 16:54:31 bb3 kernel: [] ? update_process_times+0x3e/0x80 Apr 28 16:54:31 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 Apr 28 16:54:31 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 Apr 28 16:54:31 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 Apr 28 16:54:31 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 Apr 28 16:54:31 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 Apr 28 16:54:31 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b Apr 21 08:15:13 bb3 kernel: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) Apr 21 08:15:13 bb3 kernel: Pid: 21862, comm: plugin-containe Tainted: G W 3.3.1 #1 Apr 21 08:15:13 bb3 kernel: Call Trace: Apr 21 08:15:13 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 Apr 21 08:15:13 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 Apr 21 08:15:13 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 Apr 21 08:15:13 bb3 kernel: [] ? update_process_times+0x3e/0x80 Apr 21 08:15:13 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 Apr 21 08:15:13 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 Apr 21 08:15:13 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 Apr 21 08:15:13 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 Apr 21 08:15:13 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 Apr 21 08:15:13 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b Apr 15 11:20:02 bb3 kernel: INFO: rcu_bh detected stall on CPU 0 (t=0 jiffies) Apr 15 11:20:02 bb3 kernel: Pid: 4691, comm: plugin-containe Not tainted 3.3.1 #1 Apr 15 11:20:02 bb3 kernel: Call Trace: Apr 15 11:20:02 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 Apr 15 11:20:02 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 Apr 15 11:20:02 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 Apr 15 11:20:02 bb3 kernel: [] ? update_process_times+0x3e/0x80 Apr 15 11:20:02 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 Apr 15 11:20:02 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 Apr 15 11:20:02 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 Apr 15 11:20:02 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 Apr 15 11:20:02 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 Apr 15 11:20:02 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b Apr 12 17:59:35 bb3 kernel: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) Apr 12 17:59:35 bb3 kernel: Pid: 23600, comm: plugin-containe Not tainted 3.3.1 #1 Apr 12 17:59:35 bb3 kernel: Call Trace: Apr 12 17:59:35 bb3 kernel: [] ? __rcu_pending+0x16b/0x3f0 Apr 12 17:59:35 bb3 kernel: [] ? _raw_spin_unlock+0x11/0x30 Apr 12 17:59:35 bb3 kernel: [] ? tick_nohz_handler+0xe0/0xe0 Apr 12 17:59:35 bb3 kernel: [] ? rcu_check_callbacks+0xfb/0x170 Apr 12 17:59:35 bb3 kernel: [] ? update_process_times+0x3e/0x80 Apr 12 17:59:35 bb3 kernel: [] ? tick_sched_timer+0x5a/0xb0 Apr 12 17:59:35 bb3 kernel: [] ? __run_hrtimer+0x60/0x140 Apr 12 17:59:35 bb3 kernel: [] ? hrtimer_interrupt+0xed/0x200 Apr 12 17:59:35 bb3 kernel: [] ? smp_apic_timer_interrupt+0x63/0xa0 Apr 12 17:59:35 bb3 kernel: [] ? apic_timer_interrupt+0x6b/0x70 Apr 12 17:59:35 bb3 kernel: [] ? system_call_fastpath+0x16/0x1b