From: Dave Jones <davej@redhat.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Christoph Lameter <cl@linux.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Pekka Enberg <penberg@kernel.org>,
linux-mm@kvack.org, David Rientjes <rientjes@google.com>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: oops in slab/leaks_show
Date: Mon, 10 Mar 2014 20:39:54 -0400 [thread overview]
Message-ID: <20140311003954.GA4798@redhat.com> (raw)
In-Reply-To: <20140311003459.GA25657@lge.com>
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?
I could reproduce it with a single cat.
Dave
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Jones <davej@redhat.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Christoph Lameter <cl@linux.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Pekka Enberg <penberg@kernel.org>,
linux-mm@kvack.org, David Rientjes <rientjes@google.com>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: oops in slab/leaks_show
Date: Mon, 10 Mar 2014 20:39:54 -0400 [thread overview]
Message-ID: <20140311003954.GA4798@redhat.com> (raw)
In-Reply-To: <20140311003459.GA25657@lge.com>
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?
I could reproduce it with a single cat.
Dave
next prev parent reply other threads:[~2014-03-11 0:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 2:57 oops in slab/leaks_show Dave Jones
2014-03-07 2:57 ` Dave Jones
2014-03-07 17:18 ` Christoph Lameter
2014-03-07 17:18 ` Christoph Lameter
2014-03-11 0:35 ` Joonsoo Kim
2014-03-11 0:35 ` Joonsoo Kim
2014-03-11 0:39 ` Dave Jones [this message]
2014-03-11 0:39 ` Dave Jones
2014-03-11 1:01 ` Joonsoo Kim
2014-03-11 1:01 ` Joonsoo Kim
2014-03-11 1:24 ` Dave Jones
2014-03-11 1:24 ` Dave Jones
2014-03-11 2:58 ` Joonsoo Kim
2014-03-11 2:58 ` Joonsoo Kim
2014-03-11 8:30 ` Joonsoo Kim
2014-03-11 8:30 ` Joonsoo Kim
2014-04-11 7:36 ` Pekka Enberg
2014-04-11 7:36 ` Pekka Enberg
2014-04-16 0:07 ` Joonsoo Kim
2014-04-16 0:07 ` Joonsoo Kim
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