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

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Message-ID: <486A68DD.80702@goop.org>
Date:	Tue, 01 Jul 2008 10:26:53 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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

H. Peter Anvin wrote:
> 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.

Well, it's also unusual because 1) it's vaddr 0, but paddr <high>, and 
2) the PHDRs are not sorted by vaddr order.  2) might actually be a bug.

    J
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