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

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Message-ID: <4874CDBC.6010500@sgi.com>
Date:	Wed, 09 Jul 2008 07:39:56 -0700
From:	Mike Travis <travis@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Jeremy Fitzhardinge wrote:
> Eric W. Biederman wrote:
>> Mike Travis <travis@....com> writes:
>>
>>  
>>> Unfortunately it's back to the problem of faulting before
>>> x86_64_start_kernel()
>>> and grub just immediately reboots.  So I'm back at analyzing
>>> assembler and
>>> config differences.
>>>     
>>
>> Ok.  That is a narrow window of code.  So it shouldn't be too bad,
>> nasty though.
>>
>> If you would like to trace through it I have attached my serial port
>> debugging routines that I use in that part of the code.
> 
> Last time it was doing this, it was a result of a triple-fault caused by
> loading %ds with an all-zero gdt.  I modified Xen to dump the CPU state
> on triple-faults, so it was easy to pinpoint.  I can do that again if it
> helps.
> 
>    J

Absolutely!  I'll repost the latest version of the patchset.  Still haven't
gotten around to enabling a XEN boot but it sure does sound handy.

Thanks,
Mike
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