linux-kernel - Re: [patch] mm: sparsemem memory_present() memory corruption fix

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Message-ID: <20080416011435.GA32147@elte.hu>
Date:	Wed, 16 Apr 2008 03:14:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com,
	apw@...dowen.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Joe Perches <joe@...ches.com>
Subject: Re: [patch] mm: sparsemem memory_present() memory corruption fix


* Ingo Molnar <mingo@...e.hu> wrote:

> but the exact incarnation depended on random details like configs, 
> which made this bug more prominent in v2.6.25-to-be.

i believe this was the reason why my many bisection attempts were 
unsuccessful: the bug pattern was not stable and seemingly working 
kernels had the memory corruption too. It was pure luck that v2.6.24 
"worked" and v2.6.25-rc9 broke visibly.

	Ingo
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