linux-kernel - Re: [crash, bisected] Re: [PATCH 3/4] x86

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Message-ID: <486A61A7.1000902@zytor.com>
Date:	Tue, 01 Jul 2008 09:56:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Mike Travis <travis@....com>,
	Christoph Lameter <clameter@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Eric W. Biederman wrote:
>>
>> The zero-based PDA mechanism requires the introduction of a new ELF segment
>> based at vaddr 0 which is sufficiently unusual that it wouldn't surprise me if
>> its triggering some toolchain bug.
> 
> Agreed.  Given the previous description my hunch is that the bug is occurring
> during objcopy.  If vmlinux is good and the compressed kernel is bad.
> 

Actually, it's not all that unusual... it's pretty common in various 
restricted environments.  That being said, it's probably uncommon for 
*64-bit* code.

	-hpa
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