Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759644AbYGJTa6 (ORCPT ); Thu, 10 Jul 2008 15:30:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753846AbYGJTau (ORCPT ); Thu, 10 Jul 2008 15:30:50 -0400 Received: from [198.99.130.12] ([198.99.130.12]:56304 "EHLO saraswathi.solana.com" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752621AbYGJTat (ORCPT ); Thu, 10 Jul 2008 15:30:49 -0400 Date: Thu, 10 Jul 2008 15:30:19 -0400 From: Jeff Dike To: Toralf =?iso-8859-1?Q?F=F6rster?= Cc: LKML , uml-devel Subject: Re: UML kernel failed to start betvee 2.6.8-rc8 and current git sources Message-ID: <20080710193019.GA20112@c2.user-mode-linux.org> References: <200807101619.54052.toralf.foerster@gmx.de> <20080710163514.GA17561@c2.user-mode-linux.org> <200807102010.02772.toralf.foerster@gmx.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <200807102010.02772.toralf.foerster@gmx.de> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1626 Lines: 47 On Thu, Jul 10, 2008 at 08:09:59PM +0200, Toralf F?rster wrote: > At Thursday 10 July 2008 18:35:15 Jeff Dike wrote : > > > What's the host? > > tfoerste@n22 ~ $ uname -a > Linux n22 2.6.25-gentoo-r6 #4 Thu Jul 10 19:49:36 CEST 2008 i686 Intel(R) Pentium(R) M processor 1700MHz GenuineIntel GNU/Linux > > BTW, this works fine and shows only the config : > n22 ~ # linux-v2.6.26-rc8-227 --showconfig > > whereas this failed: > > n22 ~ # linux-v2.6.26-rc9-56 --showconfig > Locating the bottom of the address space ... 0x0 > Locating the top of the address space ... 0xc0000000 OK, I believe you're seeing the same bug as Uli saw here: http://marc.info/?l=linux-kernel&m=121011518003727&w=2 More precise symptoms are here: http://marc.info/?l=linux-kernel&m=121011722806093&w=2 I never did figure that one out. I had the same kernel version, same toolchain, same everything as far as I could see, and I couldn't reproduce it, except with a binary that he gave me. You're seeing it on i386, whereas he saw it on x86_64. The underlying problem is that somehow the UML initcalls aren't being run, which is why you're seeing all zeros in the register dump. If you bisect this, I bet you end up at the no-unit-at-a-time patch that he ended up at. And I have no idea what that has to do with anything. Jeff -- Work email - jdike at linux dot intel dot com -- 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/