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From: "H. Peter Anvin" <hpa@zytor.com>
To: maximilian attems <max@stro.at>
Cc: 464962@bugs.debian.org, Joey Hess <joeyh@debian.org>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org
Subject: Re: Bug#464962: immediate crash on boot on TM5800
Date: Tue, 12 Feb 2008 13:42:50 -0800	[thread overview]
Message-ID: <47B212DA.3010503@zytor.com> (raw)
In-Reply-To: <20080212212416.GH22054@baikonur.stro.at>

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


  parent reply	other threads:[~2008-02-12 21:43 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20080210031849.GA3370@dragon.kitenet.net>
     [not found] ` <20080210110659.GB8574@stro.at>
     [not found]   ` <20080210192139.GA17647@kodama.kitenet.net>
     [not found]     ` <20080212160522.GB5221@stro.at>
     [not found]       ` <20080212195254.GA6252@kodama.kitenet.net>
2008-02-12 20:10         ` maximilian attems
2008-02-12 20:32           ` H. Peter Anvin
2008-02-12 21:02             ` maximilian attems
2008-02-12 21:14               ` H. Peter Anvin
2008-02-12 21:24                 ` maximilian attems
2008-02-12 21:31                   ` H. Peter Anvin
2008-02-12 21:42                   ` H. Peter Anvin [this message]
2008-02-12 21:46                   ` H. Peter Anvin
2008-02-12 22:29                 ` Joey Hess
2008-02-12 20:35           ` Joey Hess

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