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

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Message-ID: <b0943d9e0610130459w22e6b9a1g57ee67a2c2b97f81@mail.gmail.com>
Date:	Fri, 13 Oct 2006 12:59:59 +0100
From:	"Catalin Marinas" <catalin.marinas@...il.com>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"nmeyers@...tmark.com" <nmeyers@...tmark.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

On 13/10/06, Pekka Enberg <penberg@...helsinki.fi> wrote:
> On 10/13/06, nmeyers@...tmark.com <nmeyers@...tmark.com> wrote:
> > 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.
>
> You should cc Catalin for that. Alternatively, you could try
> CONFIG_DEBUG_SLAB_LEAK.

Thanks for cc'ing me (I'm still on holiday and not following the
mailing list). The problem is the __builtin_constant_p gcc function
which doesn't work properly with 4.x versions. It was fixed in latest
gcc versions though. Kmemleak relies on __builtin_constant_p to
determine the pointer aliases and without it you would get plenty of
false positives.

-- 
Catalin
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