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

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Message-ID: <20080304215852.GA14318@hjernemadsen.org>
Date:	Tue, 4 Mar 2008 22:58:52 +0100
From:	"Klaus S. Madsen" <ksm@...rnemadsen.org>
To:	Ingo Molnar <mingo@...e.hu>
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

On Tue, Mar 04, 2008 at 13:36:02 +0100, Ingo Molnar wrote:
> 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
All right. I just tried the following:

git checkout 82bc03fc158e28c90d7ed9919410776039cb4e14
make clean && make -j3 && sudo make install modules_install

And the resulting kernel works OK. However if I checkout commit
6c3866558213ff706d8331053386915371ad63ec, and compile it using the
previous commandline, s2ram fails so it seems you're right.

> > 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?
If I boot with noexec=off, s2ram starts working again.

-- 
Kind regards
	Klaus S. Madsen
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