linux-kernel - Re: 2.6.18-rc6-mm1: GPF loop on early boot

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Date:	Mon, 11 Sep 2006 07:21:27 +0200
From:	Laurent Riffard <laurent.riffard@...e.fr>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <ak@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: 2.6.18-rc6-mm1: GPF loop on early boot


Le 11.09.2006 01:03, Jeremy Fitzhardinge a écrit :
> Andrew Morton wrote:
>> I must say that having an unreliable early-current is going to be quite a
>> pita for evermore.  Things like mcount-based tricks and
>> basic-block-profiling-based tricks, for example.
>>
>> Is it really going to be too messy to fake up some statically-defined gdt
>> which points at init_task, install that before we call any C at all?
> 
> That's on my TODO list - make %gs set correctly before hitting C code, 
> and get rid of all the early_* stuff.  I had already encountered a 
> PDA-related oops with lockdep enabled, and addressed it.
> 
> It's pretty easy to solve in general for the boot CPU, but its a bit 
> more tricky to handle for secondary CPUs.
> 
> Laurent, could you resend your original oops?  It doesn't seem to have 
> appeared on lkml.

I guess my original mail was too big. Sorry for that. 
Please go to http://laurent.riffard.free.fr/2.6.18-rc6-mm1/, 
you'll find the files I sent in my first post:

* DSC02674.jpg (96k): screenshot of first GPF  
* config-2.6.18-rc6-mm1 (48k)
* dmesg-2.6.18-rc6-mm1 (25k)
 
> In the meantime, I'll work on a proper fix for this.
> 
>    J

-- 
laurent
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