linux-kernel - Re: 2.6.21-rc5-mm4 (SLUB)

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Message-ID: <Pine.LNX.4.64.0704041730470.22161@schroedinger.engr.sgi.com>
Date:	Wed, 4 Apr 2007 17:31:15 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Badari Pulavarty <pbadari@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.21-rc5-mm4 (SLUB)

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.

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