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

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Date:	Fri, 30 Jul 2010 13:14:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Ondrej Zary <linux@...nbow-software.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: Memory corruption during hibernation since 2.6.31

On Thu, 29 Jul 2010 21:10:10 -0700
Hugh Dickins <hughd@...gle.com> wrote:

> On Thu, Jul 29, 2010 at 5:01 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> 
> > I think the best way is kexec(). But maybe rollback from hibernation failure
> > will be difficult. Considering how crash-dump works well and under maintainance
> > by many enterprise guys, hibernation-by-kexec is a choice. I think. It can make
> > reuse of kdump code, ...or, hibernation-resume code can eat kdump image
> > directly. Maybe the problem will be the speed of dump.
> 
> I've no appetite for a total rework of hibernation, and I don't see
> how that would
> address the issue: I'm just looking for some protection against swap
> reuse danger.
> 
Okay ;) (And I forget that kexec has to prepare memory at boot time for 2nd kernel.
It will be harmful for small device guys.)

I'll prepare a routine not-quick-fix.
BTW, after reading mail between you and Andrea, kernel threads are not guaranteed
to be stopped when memory-dump is running ?

-Kame

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