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Date: Tue, 01 Jul 2008 10:26:53 -0700
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: "H. Peter Anvin" <hpa@zytor.com>
CC: "Eric W. Biederman" <ebiederm@xmission.com>, Mike Travis <travis@sgi.com>,
       Christoph Lameter <clameter@sgi.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area
References: <20080604003018.538497000@polaris-admin.engr.sgi.com>	<485AADAC.3070301@sgi.com> <485AB78B.5090904@goop.org>	<485AC120.6010202@sgi.com> <485AC5D4.6040302@goop.org>	<485ACA8F.10006@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>	<Pine.LNX.4.64.0806201045460.15874@schroedinger.engr.sgi.com>	<485BF8F5.6010802@goop.org> <485BFFC5.6020404@sgi.com>	<m1skv7onvh.fsf@frodo.ebiederm.org> <486912C4.8070705@sgi.com>	<48691556.2080208@zytor.com> <48691E8B.4040605@sgi.com>	<m14p7asl3x.fsf@frodo.ebiederm.org> <48694B3B.3010600@goop.org> <m1skuuov4t.fsf@frodo.ebiederm.org> <486A61A7.1000902@zytor.com>
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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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