linux-kernel - Re: mm: BUG in unmap_page

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Message-ID: <540DEDE7.4020300@oracle.com>
Date:	Mon, 08 Sep 2014 13:56:55 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Hugh Dickins <hughd@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: mm: BUG in unmap_page_range

On 09/08/2014 01:18 PM, Mel Gorman wrote:
> A worse possibility is that somehow the lock is getting corrupted but
> that's also a tough sell considering that the locks should be allocated
> from a dedicated cache. I guess I could try breaking that to allocate
> one page per lock so DEBUG_PAGEALLOC triggers but I'm not very
> optimistic.

I did see ptl corruption couple days ago:

	https://lkml.org/lkml/2014/9/4/599

Could this be related?


Thanks,
Sasha
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