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Date:	Sun, 20 Jul 2014 21:51:25 +0200
From:	Jiri Slaby <>
To:	Hugh Dickins <>
	Naoya Horiguchi <>,
	Christoph Lameter <>,
	Andrew Morton <>,
	Linus Torvalds <>
Subject: Re: [PATCH 3.12 100/170] hugetlb: fix copy_hugetlb_page_range() to
 handle migration/hwpoisoned entry

On 07/18/2014 08:53 PM, Hugh Dickins wrote:
> On Fri, 18 Jul 2014, Jiri Slaby wrote:
>> From: Naoya Horiguchi <>
>> 3.12-stable review patch.  If anyone has any objections, please let me know.
>> ===============
>> commit 4a705fef986231a3e7a6b1a6d3c37025f021f49f upstream.
>> There's a race between fork() and hugepage migration, as a result we try
>> to "dereference" a swap entry as a normal pte, causing kernel panic.
>> The cause of the problem is that copy_hugetlb_page_range() can't handle
>> "swap entry" family (migration entry and hwpoisoned entry) so let's fix
>> it.
>> [ coding-style fixes]
>> Signed-off-by: Naoya Horiguchi <>
>> Acked-by: Hugh Dickins <>
>> Cc: Christoph Lameter <>
>> Signed-off-by: Andrew Morton <>
>> Signed-off-by: Linus Torvalds <>
>> Signed-off-by: Jiri Slaby <>
> Please drop this one for now: other -stables have carried it, but it
> was found yesterday to contain a bug of its own, arguably worse than
> what it's fixing.  Naoya-san has done the fix for that, it's in mmotm
> and should make its way to Linus probably next week: so please hold
> this back until that can join it - thanks.

Thanks, I dropped it later on Fri already after Guillaume informed me
about this.

suse labs
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