Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754265Ab1EVUNN (ORCPT ); Sun, 22 May 2011 16:13:13 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:48822 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752791Ab1EVUNG (ORCPT ); Sun, 22 May 2011 16:13:06 -0400 Date: Sun, 22 May 2011 13:13:02 -0700 From: "Paul E. McKenney" To: Paul Bolle Cc: Vivek Goyal , Jens Axboe , linux kernel mailing list Subject: Re: Mysterious CFQ crash and RCU Message-ID: <20110522201302.GM2271@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20110519222404.GG12600@redhat.com> <20110521210013.GJ2271@linux.vnet.ibm.com> <1306016630.2066.44.camel@x61.thuisdomein> <20110521235408.GK2271@linux.vnet.ibm.com> <1306092657.2066.53.camel@x61.thuisdomein> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1306092657.2066.53.camel@x61.thuisdomein> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1273 Lines: 27 On Sun, May 22, 2011 at 09:30:57PM +0200, Paul Bolle wrote: > On Sat, 2011-05-21 at 16:54 -0700, Paul E. McKenney wrote: > > On Sun, May 22, 2011 at 12:23:50AM +0200, Paul Bolle wrote: > > > Is anyone able to spot one or more commits in v2.6.39-rc7..v2.6.39 that > > > might have fixed this Oops? Or did my chance of hitting this Oops, > > > somehow, just got a lot smaller in v.2.6.39? > > As I just discovered, Fedora Rawhide ships release candidates configured > with a lot more debugging options set than it ships final releases. So, > sadly, this didn't get fixed in v2.6.39. It just didn't show up because > one or more configuration options weren't set while they used to be set > in the preceding release candidates kernels. > > > 5f45c69589b7d ("read_lock() does not always imply rcu_read_lock()") might > > well be a fix. > > It doesn't really matter anymore, but that one was actually already > included in v2.6.39-rc5. OK, so maybe time to try out the debug approaches I called out earlier? Thanx, Paul -- 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/