Re: [PATCH 2/4] thp: fix regression in handling mlocked pages in __split_huge_pmd()

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On 12/24/2015 06:51 AM, Kirill A. Shutemov wrote:
> This patch fixes regression caused by patch
>  "mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pmd"
> 
> The patch makes pmd_trans_huge() check and "page = pmd_page(*pmd)" after
> __split_huge_pmd_locked(). It can never succeed, since the pmd already
> points to a page table. As result the page is never get munlocked.
> 
> It causes crashes like this:
>  http://lkml.kernel.org/r/5661FBB6.6050307@xxxxxxxxxx

So this patch didn't fix the issue for me. I've sent Kirill the trace
off-list, but it's essentially the same thing.


Thanks,
Sasha

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