From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759050AbZCTRno (ORCPT ); Fri, 20 Mar 2009 13:43:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757562AbZCTRne (ORCPT ); Fri, 20 Mar 2009 13:43:34 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:40240 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753703AbZCTRne (ORCPT ); Fri, 20 Mar 2009 13:43:34 -0400 Date: Fri, 20 Mar 2009 10:43:31 -0700 From: "Paul E. McKenney" To: Steven Rostedt Cc: Ingo Molnar , LKML , Thomas Gleixner , Peter Zijlstra , Frederic Weisbecker Subject: Re: [PATCH 0/5] [GIT PULL] updates for tip/tracing/ftrace Message-ID: <20090320174331.GH6698@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20090318031423.981603258@goodmis.org> <20090318055924.GA24627@elte.hu> <20090318073903.GA31341@elte.hu> <20090319073357.GA14615@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 19, 2009 at 01:21:47PM -0400, Steven Rostedt wrote: > > I'm still not able to reproduce, but... > > On Thu, 19 Mar 2009, Ingo Molnar wrote: > > > * Ingo Molnar wrote: > > > > > these latest ftrace changes caused a lockup on a -tip testsystem: > > > > Note, even with Rusty's offstack-cpumask fix applied (in latest > > -tip), i can reproduce a lockup: > > [ . . . ] > This looks like it is RCU/stop_machine related. The CPU is stuck in > in stop_machine? I see that rcu_torture is running. Does this go away if > you turn off rcu_torture? Grasping at straws... Does Lai's rcu_barrier() fix help? Thanx, Paul > -- Steve > > > [ 18.620342] [] ? run_workqueue+0x1a0/0x2e2 > > [ 18.620342] [] ? run_workqueue+0x14d/0x2e2 > > [ 18.620342] [] ? stop_cpu+0x0/0x1d1 > > [ 18.620342] [] ? early_idt_handler+0x0/0x73 > > [ 18.620342] [] ? worker_thread+0x138/0x14c > > [ 18.620342] [] ? autoremove_wake_function+0x0/0x4f > > [ 18.620342] [] ? worker_thread+0x0/0x14c > > [ 18.620342] [] ? kthread+0x60/0xa0 > > [ 18.620342] [] ? child_rip+0xa/0x20 > > [ 18.620342] [] ? finish_task_switch+0x56/0x180 > > [ 18.620342] [] ? restore_args+0x0/0x30 > > [ 18.620342] [] ? kthread+0x0/0xa0 > > [ 18.620342] [] ? child_rip+0x0/0x20 > > [ 64.758749] INFO: RCU detected CPU 0 stall (t=4294710313/40000 jiffies) > > [ 64.758749] Pid: 858, comm: kstop/0 Not tainted 2.6.29-rc8-tip-02638-g1c002f5-dirty #3067 > > > > (the hang is real - it lasted overnight without the system ever > > managing to boot up.) > > > > Config (note, it's different from the config i sent last) and full > > bootlog attached. > > > > Ingo > > > -- > 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/