linux-kernel - Re: 2.6.33.2 kmalloc-8 slab leaks ~512 objects per second

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Message-ID: <g2i84144f021005120600wa8eb0409k13f67f49c519509@mail.gmail.com>
Date:	Wed, 12 May 2010 16:00:51 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: 2.6.33.2 kmalloc-8 slab leaks ~512 objects per second

Hi Tvrtko,

On Wed, May 12, 2010 at 1:21 PM, Tvrtko Ursulin
<tvrtko.ursulin@...hos.com> wrote:
> As the subject says, is this a know issue? I have been tracking the growth at
> one second intervals and it looks like this:
>
> 512 (67716608) Slab:             606744 kB
> 512 (67717120) Slab:             606752 kB
> 512 (67717632) Slab:             606756 kB
> 0 (67718144) Slab:             606756 kB
> 512 (67718144) Slab:             606760 kB
> 1024 (67718656) Slab:             606768 kB
> 512 (67719680) Slab:             606772 kB
> 512 (67720192) Slab:             606776 kB
> 0 (67720704) Slab:             606776 kB
> 512 (67720704) Slab:             606780 kB
>
> First fiels is the diff in numobj, in parentheses is actual numobj and last is
> the total slab size from /proc/meminfo.
>
> kmalloc-8         68044800 68044800      8  512    1 : tunables    0    0    0
> : slabdata 132900 132900      0
>
> dm-io slab also seems large, don't know... :
> dm_io              75924 147288     40  102    1 : tunables    0    0    0 :
> slabdata   1444   1444      0
>
> Some other info about the system/kernel is attached.

[snip]

You might want to try out the built-in kernel memory leak detector.
See Documentation/kmemleak.txt for details how to enable it and use
it.

                                   Pekka
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