Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757454AbYGBWuk (ORCPT ); Wed, 2 Jul 2008 18:50:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750904AbYGBWua (ORCPT ); Wed, 2 Jul 2008 18:50:30 -0400 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:47782 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751149AbYGBWu3 (ORCPT ); Wed, 2 Jul 2008 18:50:29 -0400 Message-ID: <486C062C.3090408@sgi.com> Date: Wed, 02 Jul 2008 15:50:20 -0700 From: Mike Travis User-Agent: Thunderbird 2.0.0.6 (X11/20070801) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Jeremy Fitzhardinge , "Eric W. Biederman" , Christoph Lameter , Linux Kernel Mailing List , Ingo Molnar , Andrew Morton , Jack Steiner Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area References: <20080604003018.538497000@polaris-admin.engr.sgi.com> <485ACD92.8050109@sgi.com> <485AD138.4010404@goop.org> <485ADA12.5010505@sgi.com> <485ADC73.60009@goop.org> <485BDB04.4090709@sgi.com> <485BE80E.10209@goop.org> <485BF8F5.6010802@goop.org> <485BFFC5.6020404@sgi.com> <486912C4.8070705@sgi.com> <48691556.2080208@zytor.com> <48691E8B.4040605@sgi.com> <48694B3B.3010600@goop.org> <486A61A7.1000902@zytor.com> <486A68DD.80702@goop.org> <486A9D4F.8010508@goop.org> <486AA72B.6010401@goop.org> <486AC9D9.9030506@zytor.com> <486AD6BD.9080600@sgi.com> <486ADD67.1020809@sgi.com> <486ADD9F.3000305@zytor.com> In-Reply-To: <486ADD9F.3000305@zytor.com> 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 Content-Length: 1524 Lines: 49 H. Peter Anvin wrote: > Mike Travis wrote: >> Mike Travis wrote: >> ... I'm still re-verifying that the source bits and config options >>> are identical (it was a later git-remote update), and that in fact it is >>> the gcc --version, but that may be the conclusion. >> ... >> >> Yup, it's the gcc --version that makes the difference. GCC 4.2.0 >> couldn't >> boot past the grub screen, GCC 4.2.4 made it to the login prompt. >> > > IIRC, 4.2.0, 4.2.1 and 4.3.0 are known to miscompile the kernel in one > way or another, however, that is from memory so don't quote me on it. > > -hpa This is definitely getting strange... Ingo's randconfig at: http://redhat.com/~mingo/misc/config-Tue_Jul__1_16_48_45_CEST_2008.bad will only boot and run with gcc-4.2.4, with gcc-4.2.0 it fails at the grub screen. Other configs like: defconfig w/NR_CPUS=4096 nonuma will only boot and run with gcc-4.2.0, and does the "failure at grub" screen with gcc-4.2.4 ...! The nosmp config works with either. I'm looking at the generated vmlinux files now (well at least the assembler, I'm not really familiar enough with the linker objects to look at those.) I'm also trying to track which config options changes the behavior so radically. Any other suggestions? Thanks! Mike -- 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/