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

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

On Tue, Mar 04, 2014 at 05:46:52PM -0500, Sasha Levin wrote:
> On 03/04/2014 04:32 PM, Naoya Horiguchi wrote:
> > # 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?
> 
> I run it as root in a disposable vm, that may be the difference here.

Sorry, I didn't write it but I also run it as root on VM, so condition is
the same. It might depend on kernel config, so I'm now trying the config
you previously gave me, but it doesn't boot correctly on my environment
(panic in initialization). I may need some time to get over this.

Thanks,
Naoya

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