linux-kernel - Re: Memory corruption due to word sharing

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Date:	Thu, 2 Feb 2012 10:37:59 +0100 (CET)
From:	Richard Guenther <rguenther@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Michael Matz <matz@...e.de>, Jiri Kosina <jkosina@...e.cz>,
	Colin Walters <walters@...bum.org>, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org,
	dsterba@...e.cz, ptesarik@...e.cz, gcc@....gnu.org
Subject: Re: Memory corruption due to word sharing

On Wed, 1 Feb 2012, Linus Torvalds wrote:

> Just out of morbid curiosity, what happens if you have totally
> *separate* variables that just happen to link together? IOW, something
> like
> 
>    static struct { unsigned bit:1; } onebit;
>    static volatile int var;
> 
> and they just *happen* to link next to each other (because they were
> declared next to each other) in the same 8-byte aligned block?

Just to make you run away screaming ...

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48124

where exactly such situation happens ...

Richard.
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