linux-kernel - Re: Memory corruption during hibernation since 2.6.31

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Message-Id: <20100729115142.00a83b40.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 29 Jul 2010 11:51:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Ondrej Zary <linux@...nbow-software.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: Memory corruption during hibernation since 2.6.31

On Thu, 29 Jul 2010 10:06:26 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Wed, 28 Jul 2010 23:38:09 +0200
> Ondrej Zary <linux@...nbow-software.org> wrote:
> 
> > On Wednesday 28 July 2010 23:34:07 Rafael J. Wysocki wrote:
> > > On Wednesday, July 28, 2010, Ondrej Zary wrote:
> > > > Hello,
> > > > after very long bisection, I finally found what's causing memory
> > > > corruption during hibernation on my machine sice 2.6.31:
> > > > https://bugzilla.kernel.org/show_bug.cgi?id=15753
> > > >
> > > > It's commit c9e444103b5e7a5a3519f9913f59767f92e33baf (mm: reuse unused
> > > > swap entry if necessary).
> > > >
> > > > I don't know anything about swapping in Linux so I don't have a clue
> > > > what's wrong with that commit.
> > >
> > > Thanks for bisecting!
> > >
> > > This looks rather serious.  I'd be grateful from any clues from the mm guys
> > > involved (CCed).
> > >
> > > Do you use s2disk or the built-in hibernation code?
> > 
> > I use built-in code (echo disk >/sys/power/state). The machine has 256MB RAM 
> > and 256MB swap partition.
> > 

BTW, what happens at resume ? How to page-in and remap ?

Thanks,
-Kame





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