linux-kernel - Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend)

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Message-ID: <5017D882.6040007@redhat.com>
Date:	Tue, 31 Jul 2012 09:07:14 -0400
From:	Larry Woodman <lwoodman@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Rik van Riel <riel@...hat.com>, Hugh Dickins <hughd@...gle.com>,
	Michal Hocko <mhocko@...e.cz>, Linux-MM <linux-mm@...ck.org>,
	David Gibson <david@...son.dropbear.id.au>,
	Ken Chen <kenchen@...gle.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown
 of hugetlbfs shared page tables V2 (resend)

On 07/31/2012 08:46 AM, Mel Gorman wrote:
> On Mon, Jul 30, 2012 at 03:11:27PM -0400, Larry Woodman wrote:
>>> <SNIP>
>>> That is a surprise. Can you try your test case on 3.4 and tell us if the
>>> patch fixes the problem there? I would like to rule out the possibility
>>> that the locking rules are slightly different in RHEL. If it hits on 3.4
>>> then it's also possible you are seeing a different bug, more on this later.
>>>
>> Sorry for the delay Mel, here is the BUG() traceback from the 3.4
>> kernel with your
>> patches:
>>
>> --------------------------------------------------------------------------------------------------------------------------------------------
>> [ 1106.156569] ------------[ cut here ]------------
>> [ 1106.161731] kernel BUG at mm/filemap.c:135!
>> [ 1106.166395] invalid opcode: 0000 [#1] SMP
>> [ 1106.170975] CPU 22
>> [ 1106.173115] Modules linked in: bridge stp llc sunrpc binfmt_misc
>> dcdbas microcode pcspkr acpi_pad acpi]
>> [ 1106.201770]
> Thanks, looks very similar.
>
>> [ 1106.203426] Pid: 18001, comm: mpitest Tainted: G        W
>> 3.3.0+ #4 Dell Inc. PowerEdge R620/07NDJ2
> You say this was a 3.4 kernel but the message says 3.3. Probably not
> relevant, just interesting.
>
Oh, sorry I posted the wrong traceback.  I tested both 3.3 & 3.4 and had 
the same results.
I'll do it again and post the 3.4 traceback for you,

Larry

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