Re: [PATCH] mm: numa: Recheck for transhuge pages under lock during protection changes

[Sasha Levin <sasha.levin@oracle.com>]

On 03/21/2014 06:06 PM, Andrew Morton wrote:
> On Wed, 19 Mar 2014 14:38:32 +0000 Mel Gorman<mgorman@suse.de>  wrote:
>
>> >On Fri, Mar 14, 2014 at 11:15:37PM -0400, Sasha Levin wrote:
>>> > >On 03/12/2014 06:36 AM, Mel Gorman wrote:
>>>> > > >Andrew, this should go with the patches
>>>> > > >mmnuma-reorganize-change_pmd_range.patch
>>>> > > >mmnuma-reorganize-change_pmd_range-fix.patch
>>>> > > >move-mmu-notifier-call-from-change_protection-to-change_pmd_range.patch
>>>> > > >in mmotm please.
>>>> > > >
>>>> > > >Thanks.
>>>> > > >
>>>> > > >---8<---
>>>> > > >From: Mel Gorman<mgorman@suse.de>
>>>> > > >Subject: [PATCH] mm: numa: Recheck for transhuge pages under lock during protection changes
>>>> > > >
>>>> > > >Sasha Levin reported the following bug using trinity
>>> > >
>>> > >I'm seeing a different issue with this patch. A NULL ptr deref occurs in the
>>> > >pte_offset_map_lock() macro right before the new recheck code:
>>> > >
>> >
>> >This on top?
>> >
>> >I tried testing it but got all sorts of carnage that trinity throw up
>> >in the mix and ordinary testing does not trigger the race. I've no idea
>> >which of the current mess of trinity-exposed bugs you've encountered and
>> >got fixed already.
>> >
> Where are we at with this one?

Looking good here, haven't seen any of the issues reported in this thread.


Thanks,
Sasha

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