From: Christoph Lameter <cl@gentwo.org>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Hugh Dickins <hughd@google.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Konstantin Khlebnikov <koct9i@gmail.com>,
Mel Gorman <mgorman@suse.de>, Bob Liu <bob.liu@oracle.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: mm: NULL ptr deref in remove_migration_pte
Date: Tue, 17 Jun 2014 09:09:09 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.11.1406170907540.12946@gentwo.org> (raw)
In-Reply-To: <539F5BC5.3010501@oracle.com>
On Mon, 16 Jun 2014, Sasha Levin wrote:
> It took some time to hit something here, but I think that the following
> is related:
This related thing looks like someone did a random memset. The SLUB
diagnostic show the object, redzone and padding were overwritten with
zeros.
> [ 494.710068] =============================================================================
> [ 494.710068] BUG page->ptl (Not tainted): Redzone overwritten
> [ 494.710068] -----------------------------------------------------------------------------
> [ 494.710068]
> [ 494.710068] INFO: 0xffff8804e4730e58-0xffff8804e4730e5f. First byte 0x0 instead of 0xbb
> [ 494.710068] INFO: Slab 0xffffea001391cc00 objects=40 used=40 fp=0x (null) flags=0x56fffff80004080
> [ 494.710068] INFO: Object 0xffff8804e4730e10 @offset=3600 fp=0x (null)
> [ 494.710068]
> [ 494.710068] Bytes b4 ffff8804e4730e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> [ 494.710068] Object ffff8804e4730e10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> [ 494.710068] Object ffff8804e4730e20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> [ 494.710068] Object ffff8804e4730e30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> [ 494.710068] Object ffff8804e4730e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> [ 494.710068] Object ffff8804e4730e50: 00 00 00 00 00 00 00 00 ........
> [ 494.710068] Redzone ffff8804e4730e58: 00 00 00 00 00 00 00 00 ........
> [ 494.710068] Padding ffff8804e4730f98: 00 00 00 00 00 00 00 00 ........
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next prev parent reply other threads:[~2014-06-17 14:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-16 14:59 Sasha Levin
2014-05-05 15:51 ` Sasha Levin
2014-05-24 0:38 ` Sasha Levin
2014-05-26 20:05 ` Hugh Dickins
2014-05-27 13:52 ` Sasha Levin
2014-06-10 4:20 ` Hugh Dickins
2014-06-10 10:09 ` Kirill A. Shutemov
2014-06-16 21:04 ` Sasha Levin
2014-06-17 14:09 ` Christoph Lameter [this message]
2014-06-18 3:36 ` Hugh Dickins
2014-06-18 11:24 ` Sasha Levin
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