linux-kernel - Re: Regression in 2.6.25-rc3: s2ram segfaults before suspending

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Date:	Tue, 04 Mar 2008 15:00:16 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Klaus S. Madsen" <ksm@...rnemadsen.org>,
	Pavel Machek <pavel@....cz>,
	Suspend-devel list <suspend-devel@...ts.sourceforge.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: Regression in 2.6.25-rc3: s2ram segfaults before suspending

Ingo Molnar wrote:
> * Klaus S. Madsen <ksm@...rnemadsen.org> wrote:
>
>   
>> So while I'm fairly confident in that I bisected correctly, the number 
>> of attempts I had to go through to get a reliable result, and the fact 
>> that I cannot make the problem go away by reverting the current code 
>> to something similar, counts quite a lot against me.
>>
>> However I'm 100% confident that the problem appears between 
>> cf8fa920cb4271f17e0265c863d64bea1b31941a and 
>> 925596a017bbd045ff711b778256f459e50a119, which is something like 16 
>> commits. I have been at both points in the tree at least 2 times, and 
>> confirmed that cf8fa920cb4271f17e0265c863d64bea1b31941a worked for me, 
>> and 925596a017bbd045ff711b778256f459e50a119 didn't.
>>     
>
> my guess would be that it's this commit that causes it:
>
> | commit 6c3866558213ff706d8331053386915371ad63ec
> | Author: Jeremy Fitzhardinge <jeremy@...p.org>
> | Date:   Wed Jan 30 13:32:55 2008 +0100
> |
> |    x86: move all asm/pgtable constants into one place
>
>   
>> But I'm a bit puzzled by the fact that I'm aparently the only one how 
>> have encountered the problem? Maybe it's only a problem if one also 
>> uses PAE? (Thats just a wild guess to explain why I'm the only one 
>> seeing this).
>>     
>
> PAE activates NX on 32-bit. So we probably had an NX regression that got 
> fixed by the side-effects of one of the unifications. Does it start 
> working if you disable NX via the noexec=off boot option?

What's the state of play here?  Is upshot that this change fixed a bug 
which broke s2ram, or caused a bug which broke s2ram?

    J
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