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Date: Wed, 16 May 2012 14:53:03 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: solmac john <johnsolmac@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>, linux-mm <linux-mm@kvack.org>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Kernelnewbies@kernelnewbies.org, linux-kernel@vger.kernel.org,
        Konstantin Khlebnikov <khlebnikov@openvz.org>
Subject: Re: [bug] shrink_slab shrinkersize handling
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On Wed, 16 May 2012 14:33:18 +0530
solmac john <johnsolmac@gmail.com> wrote:

> Hi All,
> 
> During mm performance testing sometimes I observed below kernel messages
> 
> [   80.776000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2133936901
> [   80.784000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2139256767
> [   80.796000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2079333971
> [   80.804000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2096156269
> [   80.812000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-20658392
> 
> ...
>
> I found one patch  http://lkml.org/lkml/2011/8/22/80    for this fix
> Please let me know reason why I am getting above error and above is really
> fix for this problem.  ?

Yes, that patch should fix it.

Aside: I spent some time trying to work out the reason why local
variable `max_pass' in shrink_slab() is called `max_pass' and failed.