From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754387Ab0IIU1G (ORCPT ); Thu, 9 Sep 2010 16:27:06 -0400 Received: from ackle.nomi.cz ([81.31.33.35]:43866 "EHLO ackle.nomi.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752754Ab0IIU1F (ORCPT ); Thu, 9 Sep 2010 16:27:05 -0400 X-Greylist: delayed 2041 seconds by postgrey-1.27 at vger.kernel.org; Thu, 09 Sep 2010 16:27:04 EDT Date: Thu, 9 Sep 2010 21:53:01 +0200 From: =?utf-8?B?VG9tw6HFoSBKYW5vdcWhZWs=?= To: Greg KH Cc: Jeremy Fitzhardinge , mingo@redhat.com, "H. Peter Anvin" , linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, glommer@redhat.com, alan@lxorguk.ukuu.org.uk, zamsden@redhat.com, stable@kernel.org, mtosatti@redhat.com, gregkh@suse.de, peter@palfrader.org, tglx@linutronix.de, avi@redhat.com, linux-tip-commits@vger.kernel.org Subject: Re: [stable] [tip:x86/urgent] x86: Add memory modify constraints to xchg() and cmpxchg() Message-ID: <20100909195301.GA18291@nomi.cz> References: <4C4F7277.8050306@zytor.com> <4C5759FF.1000807@goop.org> <20100802235950.GA662@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20100802235950.GA662@kroah.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, 2.6.32.21 does not boot on my HP Compaq nx7300. I bisected it to this patch: On Mon, Aug 02, 2010 at 04:59:50PM -0700, Greg KH wrote: > On Mon, Aug 02, 2010 at 04:51:27PM -0700, Jeremy Fitzhardinge wrote: > > On 07/27/2010 10:33 PM, tip-bot for H. Peter Anvin wrote: > > >Commit-ID: 113fc5a6e8c2288619ff7e8187a6f556b7e0d372 > > >Gitweb: http://git.kernel.org/tip/113fc5a6e8c2288619ff7e8187a6f556b7e0d372 > > >Author: H. Peter Anvin > > >AuthorDate: Tue, 27 Jul 2010 17:01:49 -0700 > > >Committer: H. Peter Anvin > > >CommitDate: Tue, 27 Jul 2010 17:14:02 -0700 > > > > > >x86: Add memory modify constraints to xchg() and cmpxchg() > > > > Here's the 2.6.32 version for stable. > > Thanks, I'll queue it up when it hits Linus's tree. Here's a video of the crash: http://store.lisk.in/tmp/09092010019.mp4 With boot_delay=30, it sometimes just reboots and sometimes prints the trace. Without it, it always prints the trace. The crash occurs during the initialization of intel-agp (which explains why I can't reproduce it in qemu). More details in the video. The system boots and works just fine with 2.6.32.21 with the patch reverted. v2.6.36-rc3-185-gd56557a works fine as well, perhaps there were other fixes that didn't get to stable (e.g. 4532b30). I'm compiling the kernel with the latest gcc in Debian (-dumpversion says 4.4.5, dpkg reports 4:4.4.4-2). Shall I post dmesg/lspci as well? Since I have an easy workaround and other things to do, I won't spend time trying to backport those other fixes myself, but if you're going to fix this, I will help with testing. Regards, -- Tomáš Janoušek, a.k.a. Liskni_si, http://work.lisk.in/