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Date:	Mon, 28 Jul 2014 16:02:31 -0700 (PDT)
From:	David Rientjes <>
To:	Naoya Horiguchi <>
cc:	Andrew Morton <>,
	Hugh Dickins <>,,,
	Naoya Horiguchi <>
Subject: Re: [PATCH 2/3] mm/hugetlb: take refcount under page table lock in

On Mon, 28 Jul 2014, Naoya Horiguchi wrote:

> We have a race condition between move_pages() and freeing hugepages,
> where move_pages() calls follow_page(FOLL_GET) for hugepages internally
> and tries to get its refcount without preventing concurrent freeing.
> This race crashes the kernel, so this patch fixes it by moving FOLL_GET
> code for hugepages into follow_huge_pmd() with taking the page table lock.

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