From: Richard Guenther <rguenther@suse.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Matz <matz@suse.de>, Jiri Kosina <jkosina@suse.cz>,
Colin Walters <walters@verbum.org>, Jan Kara <jack@suse.cz>,
LKML <linux-kernel@vger.kernel.org>,
linux-ia64@vger.kernel.org, dsterba@suse.cz, ptesarik@suse.cz,
gcc@gcc.gnu.org
Subject: Re: Memory corruption due to word sharing
Date: Thu, 2 Feb 2012 10:37:59 +0100 (CET) [thread overview]
Message-ID: <alpine.LNX.2.00.1202021037180.4999@zhemvz.fhfr.qr> (raw)
In-Reply-To: <CA+55aFxt3rG8_HyoRqiMOKVDqaGTkRk=Kh+bAJTAxxdHAGzuVw@mail.gmail.com>
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.
next prev parent reply other threads:[~2012-02-02 9:38 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 15:19 Memory corruption due to word sharing Jan Kara
2012-02-01 15:34 ` Markus Trippelsdorf
2012-02-01 16:37 ` Colin Walters
2012-02-01 16:56 ` Linus Torvalds
2012-02-01 17:11 ` Jiri Kosina
2012-02-01 17:37 ` Linus Torvalds
2012-02-01 17:41 ` Michael Matz
2012-02-01 18:09 ` David Miller
2012-02-01 18:45 ` Jeff Law
2012-02-01 19:09 ` Linus Torvalds
2012-02-02 15:51 ` Jeff Garzik
2012-02-01 18:57 ` Linus Torvalds
2012-02-01 19:04 ` Peter Bergner
2012-02-01 18:52 ` Linus Torvalds
2012-02-02 9:35 ` Richard Guenther
2012-02-02 9:37 ` Richard Guenther [this message]
2012-02-02 13:43 ` Michael Matz
2012-02-01 16:41 ` Linus Torvalds
2012-02-01 17:42 ` Torvald Riegel
2012-02-01 19:40 ` Jakub Jelinek
2012-02-01 20:01 ` Linus Torvalds
2012-02-01 20:16 ` Jakub Jelinek
2012-02-01 20:44 ` Linus Torvalds
2012-02-02 15:58 ` Aldy Hernandez
2012-02-02 16:28 ` Michael Matz
2012-02-02 17:51 ` Linus Torvalds
2012-02-01 20:19 ` Linus Torvalds
2012-02-02 9:46 ` Richard Guenther
2012-02-01 19:44 ` Boehm, Hans
2012-02-01 19:54 ` Jeff Law
2012-02-01 19:47 ` Linus Torvalds
2012-02-01 19:58 ` Alan Cox
2012-02-01 20:41 ` Torvald Riegel
2012-02-01 20:59 ` Linus Torvalds
2012-02-01 21:24 ` Torvald Riegel
2012-02-01 21:55 ` Linus Torvalds
2012-02-01 21:25 ` Boehm, Hans
2012-02-01 22:27 ` Linus Torvalds
2012-02-01 22:45 ` Paul E. McKenney
2012-02-01 23:11 ` Linus Torvalds
2012-02-02 18:42 ` Paul E. McKenney
2012-02-02 19:08 ` Linus Torvalds
2012-02-02 19:37 ` Paul E. McKenney
2012-02-03 16:38 ` Andrew MacLeod
2012-02-03 17:16 ` Linus Torvalds
2012-02-03 19:16 ` Andrew MacLeod
2012-02-03 20:00 ` Linus Torvalds
2012-02-03 20:19 ` Paul E. McKenney
2012-02-06 15:38 ` Torvald Riegel
2012-02-10 19:27 ` Richard Henderson
2012-02-02 11:19 ` Ingo Molnar
2012-02-01 21:04 ` Boehm, Hans
2012-02-02 9:28 ` Bernd Petrovitsch
2012-02-01 17:08 ` Torvald Riegel
2012-02-01 17:29 ` Linus Torvalds
2012-02-01 20:53 ` Torvald Riegel
2012-02-01 21:20 ` Linus Torvalds
2012-02-01 21:37 ` Torvald Riegel
2012-02-01 22:18 ` Boehm, Hans
2012-02-02 11:11 ` James Courtier-Dutton
2012-02-02 11:24 ` Richard Guenther
2012-02-02 11:13 ` David Sterba
2012-02-02 11:23 ` Richard Guenther
2012-02-03 6:45 ` DJ Delorie
2012-02-03 9:37 ` Richard Guenther
2012-02-03 10:03 ` Matthew Gretton-Dann
2012-02-01 17:52 Dennis Clarke
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