From: David Rientjes <rientjes@google.com>
To: Christoph Lameter <cl@gentwo.org>,
Sasha Levin <sasha.levin@oracle.com>,
Wei Yang <weiyang@linux.vnet.ibm.com>
Cc: Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: mm: slub: invalid memory access in setup_object
Date: Mon, 30 Jun 2014 15:03:21 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1406301500410.13545@chino.kir.corp.google.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1406251228130.29216@gentwo.org>
On Wed, 25 Jun 2014, Christoph Lameter wrote:
> On Wed, 25 Jun 2014, Sasha Levin wrote:
>
> > [ 791.669480] ? init_object (mm/slub.c:665)
> > [ 791.669480] setup_object.isra.34 (mm/slub.c:1008 mm/slub.c:1373)
> > [ 791.669480] new_slab (mm/slub.c:278 mm/slub.c:1412)
>
> So we just got a new page from the page allocator but somehow cannot
> write to it. This is the first write access to the page.
>
I'd be inclined to think that this was a result of "slub: reduce duplicate
creation on the first object" from -mm[*] that was added the day before
Sasha reported the problem.
It's not at all clear to me that that patch is correct. Wei?
Sasha, with a revert of that patch, does this reproduce?
[*] http://ozlabs.org/~akpm/mmotm/broken-out/slub-reduce-duplicate-creation-on-the-first-object.patch
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next prev parent reply other threads:[~2014-06-30 22:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-25 16:51 Sasha Levin
2014-06-25 17:30 ` Christoph Lameter
2014-06-30 22:03 ` David Rientjes [this message]
2014-07-01 1:40 ` Wei Yang
2014-07-01 14:58 ` Christoph Lameter
2014-07-01 21:49 ` Andrew Morton
2014-07-01 21:52 ` Sasha Levin
2014-07-02 14:44 ` Christoph Lameter
2014-07-02 2:06 ` Wei Yang
2014-07-02 15:07 ` Christoph Lameter
2014-07-03 2:23 ` Wei Yang
2014-07-02 2:04 ` Wei Yang
2014-07-02 14:20 ` Christoph Lameter
2014-07-03 12:40 ` Wei Yang
2014-07-07 13:51 ` Christoph Lameter
2014-07-08 1:34 ` Wei Yang
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