linux-kernel - Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443 kmem_cache_destroy, scsi_put_host_cmd

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Message-ID: <20080421135052.GL9554@elte.hu>
Date:	Mon, 21 Apr 2008 15:50:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [bug] SCSI/SLUB - latest -git: WARNING: at mm/slub.c:2443
	kmem_cache_destroy, scsi_put_host_cmd_pool()


* Christoph Lameter <clameter@....com> wrote:

> On Sat, 19 Apr 2008, Pekka J Enberg wrote:
> 
> > > [a few .config options were turned off: just accept all the defaults 
> > >  after 'make oldconfig']
> > 
> > I couldn't spot anything in particular in SLUB which makes me think 
> > SCSI code simply didn't free all objects before 
> > scsi_put_host_cmd_pool() called kmem_cache_destroy() to kill the 
> > cache.
> > 
> > James, does this make sense or should I just look at SLUB harder?
> 
> The WARN is intended to warn that a kmem_cache_destroy was run with 
> objects not freed.

i suspect if that warn-on triggers more frequently then it might make 
sense to turn it into a pretty SLUB warning about that cache, with a 
stackdump at the end. (that way people are not tricked into mistakenly 
believing that it's a SLUB bug)

	Ingo
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