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Date:	Sat, 1 May 2010 20:56:18 -0500 (CDT)
From:	Christoph Lameter <>
To:	Mel Gorman <>
cc:	Andrew Morton <>,
	Linux-MM <>,
	LKML <>,
	Minchan Kim <>,
	KAMEZAWA Hiroyuki <>,
	Andrea Arcangeli <>,
	Rik van Riel <>
Subject: Re: [PATCH 2/2] mm,migration: Avoid race between shift_arg_pages()
 and rmap_walk() during migration by not migrating temporary stacks

On Thu, 29 Apr 2010, Mel Gorman wrote:

> There is a race between shift_arg_pages and migration that triggers this bug.
> A temporary stack is setup during exec and later moved. If migration moves
> a page in the temporary stack and the VMA is then removed before migration
> completes, the migration PTE may not be found leading to a BUG when the
> stack is faulted.

A simpler solution would be to not allow migration of the temporary stack?

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