Re: [PATCH 2/2] mm,migration: Avoid race between shift_arg_pages()and rmap_walk() during migration by not migrating temporary stacks

[Christoph Lameter]

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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