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

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Date:	Tue, 11 Mar 2014 17:02:47 -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 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.


Thanks,
Sasha

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