linux-kernel - Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

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Message-ID: <20061013105502.GA9773@viviport.com>
Date:	Fri, 13 Oct 2006 06:55:02 -0400
From:	nmeyers@...tmark.com
To:	Mike Galbraith <efault@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

On Fri, Oct 13, 2006 at 08:25:12AM +0000, Mike Galbraith wrote:
> On Thu, 2006-10-12 at 20:49 -0400, nmeyers@...tmark.com wrote:
> 
> > I tried Catalin Marinas' kmemleak patches, and had to rebuild with
> > GCC 3.4.6 because of a 4.1.1 compiler bug that prevents compilation
> > of the patches.
> 
> Yeah, seems any remotely recent gcc hates it.  That puts a rather large
> dent in usability.
> 
> > And... building with 3.4.5 fixed the leak! So I guess I have very little
> > detail to report - except that there's a nasty leak in 2.6.17 when built
> > with 4.1.1.
> 
> If you build using 3.4.5 _without_ the kmemleak patches, do you see the
> leak again?  (ie is kmemleak altering timing, or is kernel miscompiled)

I wondered the same thing. I went back to the original source and .config
- rebuilding with 3.4.6 (3.4.5 is a typo) fixed the leak.

> 
> > If anyone has a version of kmemleak that I can build with 4.1.1, or
> > any other suggestions for instrumentation, I'd be happy to gather more
> > data - the problem is very easy for me to reproduce.
> 
> I can only suggest trying latest/greatest to see if the issue is still
> present, and if so, try to find a way that others may trigger it.

I may just do that - apparently 4.1.2 is supposed to fix the kmemleak
compile problem. My (admittedly lazy) inclination is to wait until that
comes out in a Gentoo ebuild.

Nathan


> 
> 	-Mike
> 
> 
-
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