Re: memory leak in alloc_huge_page

[Mike Kravetz]

On 12/01/2015 11:45 AM, Dmitry Vyukov wrote:
> On Tue, Dec 1, 2015 at 7:52 PM, Mike Kravetz <mike.kravetz@xxxxxxxxxx> wrote:
>> On 12/01/2015 06:04 AM, Dmitry Vyukov wrote:

>>> There seems to be another leak if nrg is not NULL on this path, but
>>> it's not what happens in my case since the WARNING does not fire.
>>
>> If nrg is not NULL, then it was added to the resv map and 'should' be
>> free'ed when the map is free'ed.  This is not optimal, but I do not
>> think it would lead to a leak.  I'll take a close look at this code
>> with an emphasis on the leak you discovered.
> 
> 
> Hi Mike,
> 
> Note that it's not just a leak report, it is an actual leak. You
> should be able to reproduce it.
> 

OK, finally found the bug which is in region_del().  It does not correctly
handle a "placeholder" region descriptor that is left after an aborted
operation when the start of the region to be deleted is for the same page.

I will have a patch shortly, after some testing.

-- 
Mike Kravetz
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