linux-kernel - Re: WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (f6f6e1a4), by kmemleak's scan

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Message-ID: <20090825084808.GA14003@elte.hu>
Date:	Tue, 25 Aug 2009 10:48:08 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: WARNING: kmemcheck: Caught 32-bit read from uninitialized
	memory (f6f6e1a4), by kmemleak's scan_block()


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> On Tue, 2009-08-25 at 10:32 +0200, Ingo Molnar wrote:
> > > In any case, I don't think it is very productive to run them both 
> > > at the same time, simply because kmemcheck slows every memory 
> > > access down so much and scanning memory doesn't exactly help that. 
> > > It _could_ be useful to have them compiled into the same kernel, 
> > > though, e.g. a distro "-debug" kernel.
> > > 
> > > Maybe you can just add the "depends on !KMEMLEAK" to 
> > > CONFIG_KMEMCHECK in tip/out-of-tree for now?
> > 
> > i think it would be far more intelligent to annotate those accesses 
> > by kmemleak as 'trust me, dont check'. Willing to test such a patch.
> 
> I guess something like this totally untested patch should do it. 
> Vegard, Catalin?

Looks good - but doesnt apply cleanly to -tip because i picked up a 
number of kmemleak patches into tip:out-of-tree for testing - so 
i'll leave it up for Vegard/Catalin to do a blessed version of it 
against the kmemleak tree - which i hope will apply fine to tip too
:)

	Ingo
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