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Date: Wed, 4 Apr 2007 17:31:15 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Badari Pulavarty <pbadari@gmail.com>
cc: Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: 2.6.21-rc5-mm4 (SLUB)
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On Wed, 4 Apr 2007, Badari Pulavarty wrote:

> On Wed, 2007-04-04 at 15:59 -0700, Christoph Lameter wrote:
> > On Wed, 4 Apr 2007, Badari Pulavarty wrote:
> > 
> > > Here is the slub_debug=FU output with the above patch.
> > 
> > Hmmm... Looks like the object is actually free. Someone writes beyond the 
> > end of the earlier object. Setting Z should check overwrites but it 
> > switched off merging. So set
> > 
> > slub_debug = FZ
> > 
> > Analoguos to the last patch you would need to take out redzoning from 
> > the flags that stop merging. Then rerun. Maybe we can track it down this 
> > way.
> 
> Hmm.. I did that and machine boots fine, with absolutely no
> debug messages :(

Were the slabs merged? Look at /sys/slab and see if there are any symlinks 
there.