linux-kernel - Re: Dynamic Debug lib: Fix memory corruption for specific module declarations

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Message-Id: <20100709165752.0daac206.akpm@linux-foundation.org>
Date:	Fri, 9 Jul 2010 16:57:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	linux-kernel@...r.kernel.org, andi@...stfloor.org, hare@...e.de,
	stable@...nel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Jason Baron <jbaron@...hat.com>
Subject: Re: Dynamic Debug lib: Fix memory corruption for specific module
 declarations

On Fri, 9 Jul 2010 13:10:42 +0200
Thomas Renninger <trenn@...e.de> wrote:

> From: Jason Baron <jbaron@...hat.com>

You forgot to cc Jason.

> Make sure we properly call ddebug_remove_module() when a module fails to
> load. In addition, pass the pointer to the "debug table", to both
> ddebug_add_module(), and ddebug_remove_module() so that we can uniquely
> identify each set of debug statements. In this way even modules with the
> same name can be properly identified and removed.
> 
> Kernel bug reference:
> http://bugzilla.kernel.org/show_bug.cgi?id=16330
> 
> By trenn (for stable people):
> Not sure for how long this bug exists (always?), it nearly patches
> fine for a 2.6.32 kernel...

It's unclear what kernel this is against.  It applies quite badly to
mainline.  I fixed all that up then lost the result :( It doesn't apply
cleanly to 2.6.34 either.

I was going to steal your changelog and add it to Jason's patch but
Jason's patch generates a reject storm against mainline too.

Giving up.

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