linux-kernel - Re: Bug#464962: immediate crash on boot on TM5800

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Date:	Tue, 12 Feb 2008 13:42:50 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	maximilian attems <max@...o.at>
CC:	464962@...s.debian.org, Joey Hess <joeyh@...ian.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Bug#464962: immediate crash on boot on TM5800

maximilian attems wrote:
> On Tue, Feb 12, 2008 at 01:14:04PM -0800, H. Peter Anvin wrote:
>> Are you sure that build matches the bug report?
> 
> urrgs right sorry, the posted vmlinux is a newer 
> 2.6.24-git22 and not  Version: 2.6.24-3
>  
>> The EIP given falls inside the .data segment of that kernel, 
>> specifically inside the symbol init_task.
>>
>> 	-hpa
> 
> will rebuild aboves.

Okay, the faulting instruction is the following:

c0383360:       0f 1f 40 00             nopl   0x0(%eax)

The Crusoe code morphing software apparently doesn't recognize these 
"long noops", and (presumably) the rest of the hinting NOOP group.  gcc 
didn't use to generate them, and Crusoe/Efficeon generally do not 
benefit from code alignment anyway.  I suspect the best thing to do is 
to use either a 586 kernel or build a dedicated Crusoe kernel without 
code alignment.

	-hpa

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