Re: [PATCH] mm: add pte_present() check on existing hugetlb_entry callbacks

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# sorry if duplicate message

On Mon, Mar 03, 2014 at 04:38:41PM -0500, Sasha Levin wrote:
> On 03/03/2014 03:06 PM, Sasha Levin wrote:
> >On 03/03/2014 12:02 AM, Naoya Horiguchi wrote:
> >>Hi Sasha,
> >>
> >>>>I can confirm that with this patch the lockdep issue is gone. However, the NULL deref in
> >>>>walk_pte_range() and the BUG at mm/hugemem.c:3580 still appear.
> >>I spotted the cause of this problem.
> >>Could you try testing if this patch fixes it?
> >
> >I'm seeing a different failure with this patch:
> 
> And the NULL deref still happens.

I don't yet find out the root reason why this issue remains.
So I tried to run trinity myself but the problem didn't reproduce.
(I did simply like "./trinity --group vm --dangerous" a few hours.)
Could you show more detail or tips about how the problem occurs?

Thanks,
Naoya

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