From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932337Ab2GFJVp (ORCPT ); Fri, 6 Jul 2012 05:21:45 -0400 Received: from nat28.tlf.novell.com ([130.57.49.28]:51101 "EHLO nat28.tlf.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755599Ab2GFJVP convert rfc822-to-8bit (ORCPT ); Fri, 6 Jul 2012 05:21:15 -0400 Message-Id: <4FF6BDFB020000780008DFEF@nat28.tlf.novell.com> X-Mailer: Novell GroupWise Internet Agent 12.0.0 Date: Fri, 06 Jul 2012 09:29:15 +0100 From: "Jan Beulich" To: "Olaf Hering" Cc: , , Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during kexec boot References: <20120705210607.GA26908@aepfle.de> In-Reply-To: <20120705210607.GA26908@aepfle.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> On 05.07.12 at 23:06, Olaf Hering wrote: > My question is: were to put additional debug to trace the copying of the > data section to its final destination? Is this a task of kexec -l or > does that happen during decompressing? I suspect the latter. This is the > console output before the crash (the crash happens in 'movq %rax, %cr3'): > > ... > [ 44.072548] Starting new kernel > I'm in purgatory > early console in decompress_kernel > > Decompressing Linux... Parsing ELF... done. According to this, I'd first of all extend the printing done on arch/x86/boot/compressed/misc.c:parse_elf(). One possible problem (without much looking at how the individual address ranges get determined) could be overlapping memory ranges in the call to memcpy() inside the loop. Jan