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

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Date:	Tue, 4 Mar 2008 13:36:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Klaus S. Madsen" <ksm@...rnemadsen.org>
Cc:	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>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: Regression in 2.6.25-rc3: s2ram segfaults before suspending


* 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?

	Ingo
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