linux-kernel - Re: mm: mmap_sem lock assertion failure in __mlock_vma_pages

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Message-ID: <531F8C3A.1040502@oracle.com>
Date:	Tue, 11 Mar 2014 18:20:42 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Davidlohr Bueso <davidlohr@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm: mmap_sem lock assertion failure in __mlock_vma_pages_range

On 03/11/2014 05:45 PM, Davidlohr Bueso wrote:
> On Tue, 2014-03-11 at 17:02 -0400, Sasha Levin wrote:
>> >On 03/11/2014 04:47 PM, Davidlohr Bueso wrote:
>>>> > >>Bingo! With the above patch:
>>>>> > >> >
>>>>> > >> >[  243.565794] kernel BUG at mm/vmacache.c:76!
>>>>> > >> >[  243.566720] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
>>>>> > >> >[  243.568048] Dumping ftrace buffer:
>>>>> > >> >[  243.568740]    (ftrace buffer empty)
>>>>> > >> >[  243.569481] Modules linked in:
>>>>> > >> >[  243.570203] CPU: 10 PID: 10073 Comm: trinity-c332 Tainted: G        W    3.14.0-rc5-next-20140307-sasha-00010-g1f812cb-dirty #143
>>> > >and this is also part of the DEBUG_PAGEALLOC + trinity combo! I suspect
>>> > >the root cause it the same as Fengguang's report.
>> >
>> >The BUG still happens without DEBUG_PAGEALLOC.
> Any idea what trinity itself is doing?
>
> Could you add the following, I just want to make sure the bug isn't
> being caused by an overflow:

Not hitting that WARN.


Thanks,
Sasha
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