linux-kernel - Re: oops in slab/leaks

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Message-ID: <20140311010135.GA25845@lge.com>
Date:	Tue, 11 Mar 2014 10:01:35 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>,
	Dave Jones <davej@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: oops in slab/leaks_show

On Tue, Mar 11, 2014 at 09:35:00AM +0900, Joonsoo Kim wrote:
> On Fri, Mar 07, 2014 at 11:18:30AM -0600, Christoph Lameter wrote:
> > Joonsoo recently changed the handling of the freelist in SLAB. CCing him.
> > 
> > On Thu, 6 Mar 2014, Dave Jones wrote:
> > 
> > > I pretty much always use SLUB for my fuzzing boxes, but thought I'd give SLAB a try
> > > for a change.. It blew up when something tried to read /proc/slab_allocators
> > > (Just cat it, and you should see the oops below)
> 
> Hello, Dave.
> 
> Today, I did a test on v3.13 which contains all my changes on the handling of
> the freelist in SLAB and couldn't trigger oops by just 'cat /proc/slab_allocators'.
> 
> So I look at the code and find that there is race window if there is multiple users
> doing 'cat /proc/slab_allocators'. Did your test do that?

Opps, sorry. I am misunderstanding something. Maybe there is no race.
Anyway, How do you test it?

Thanks.
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