Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756472Ab2FNQT5 (ORCPT ); Thu, 14 Jun 2012 12:19:57 -0400 Received: from www.linutronix.de ([62.245.132.108]:58850 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756133Ab2FNQTz (ORCPT ); Thu, 14 Jun 2012 12:19:55 -0400 Date: Thu, 14 Jun 2012 18:19:50 +0200 (CEST) From: Thomas Gleixner To: "Paul E. McKenney" cc: LKML , Peter Zijlstra , Ingo Molnar , "Srivatsa S. Bhat" , Rusty Russell , Tejun Heo Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads In-Reply-To: <20120614153828.GA31135@linux.vnet.ibm.com> Message-ID: References: <20120613105815.206105518@linutronix.de> <20120613185748.GF2427@linux.vnet.ibm.com> <20120613191745.GG2427@linux.vnet.ibm.com> <20120613204725.GA9858@linux.vnet.ibm.com> <20120614045125.GA30257@linux.vnet.ibm.com> <20120614125939.GC2443@linux.vnet.ibm.com> <20120614145038.GB2458@linux.vnet.ibm.com> <20120614153828.GA31135@linux.vnet.ibm.com> User-Agent: Alpine 2.02 (LFD 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1372 Lines: 30 On Thu, 14 Jun 2012, Paul E. McKenney wrote: > On Thu, Jun 14, 2012 at 07:50:38AM -0700, Paul E. McKenney wrote: > > On Thu, Jun 14, 2012 at 03:32:19PM +0200, Thomas Gleixner wrote: > > > On Thu, 14 Jun 2012, Paul E. McKenney wrote: > > > > On Thu, Jun 14, 2012 at 01:20:39PM +0200, Thomas Gleixner wrote: > > > > > I gave it a quick shot, but I was not able to reproduce the hang yet. > > > > > > > > Really? I have a strictly Western-Hemisphere bug? ;-) > > > > > > I guess I need to fire up rcu torture to make it surface. > > > > A simple offline was triggering it for me. Perhaps some of my debug > > code was inappropriate, will retry. > > And removing my debug code did the trick. I guess some of it was really > just bug code. In any case, it now passes short rcutorture testing for > me as well. > > However, I do see the splat shown below. The splat confuses me greatly, > as I thought that this kthread should be affinitied to a single CPU and > thus smp_processor_id() should refrain from splatting. I don't see any > sort of "I broke affinity" message from the scheduler. Hmm. Is that reproducible ? -- 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/