Re: [patch added to the 3.12 stable tree] hugetlb: fix copy_hugetlb_page_range() to handle migration/hwpoisoned entry

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On 07/18/2014 03:13 PM, Guillaume Morin wrote:
> On 18 Jul  9:26, Jiri Slaby wrote:
>>
>> From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
>>
>> This patch has been added to the 3.12 stable tree. If you have any
>> objections, please let us 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.
>>
> 
> This change introduces a regression.  You might want to drop this patch
> until the fix reaches Linus' tree:
> https://lkml.org/lkml/2014/7/17/671

Oh, now dropped. Thanks.


-- 
js
suse labs
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