Student preparing for GSoC

Kieran Duggan kieranduggan15 at
Mon Mar 19 01:31:53 CDT 2018

Yes that is very useful!
I took a look at the first one I saw on the list. It goes:

==3551== 8 bytes in 1 blocks are definitely lost in loss record 63 of 766
==3551==    at 0x7BC51061: notify_alloc (heap.c:254)
==3551==    by 0x7BC5554F: RtlAllocateHeap (heap.c:1716)
==3551==    by 0x5C85281: XAudio2Create (xaudio_dll.c:2159)
==3551==    by 0x4A1B741: func_xaudio2 (xaudio2.c:1150)
==3551==    by 0x4A1C74F: run_test (test.h:603)
==3551==    by 0x4A1CBAD: main (test.h:687)

To fix it I looked at the XAudio2Create function and noticed that
IClassFactory *cf was assigned in the call
make_xaudio2_factory(&IID_IClassFactory, (void**)&cf);
which contains
struct xaudio2_cf *ret = HeapAlloc(GetProcessHeap(), 0, sizeof(struct

Later in the code IClassFactory_Release(cf); is used, but this wouldn't
free up the space on the heap because of how that function is implemented.

I'm typing this all out because I don't know how good my thought process is
on this. I'm not used to it so trying to chase all these function calls
around is kind of difficult. I would appreciate any feedback

On Sat, Mar 17, 2018 at 12:27 PM, Henri Verbeet <hverbeet at> wrote:

> On 17 March 2018 at 19:06, Kieran Duggan <kieranduggan15 at> wrote:
> > So I've gone off to look for some fixmes. I started looking at a game
> I've
> > tried to run in the past with no success, Fortnite.
> > Do any of the fixmes in the bug report look doable for a persons first
> > patch?
> >
> In case it helps you or anyone else, we also have a number of issues
> found by Valgrind [1], most of which should be fairly straightforward
> to debug and most of which should only have a limited scope. If you're
> feeling a little more ambitious, I also have lists of Direct3D [2] and
> D3DX [3] bugs with various levels of analysis I'd love for someone to
> take a look at.
> [1]
> UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_
> status=REOPENED&columnlist=bug_id%2Cshort_desc%2Cbug_
> status%2Cresolution&keywords=valgrind&order=bug_id%20DESC
> [2]
> UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_
> status=REOPENED&columnlist=bug_id%2Cshort_desc%2Cbug_
> status%2Cresolution&component=directx-d3d&keywords=download&
> order=bug_id%20DESC
> [3]
> UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_
> status=REOPENED&columnlist=bug_id%2Cshort_desc%2Cbug_
> status%2Cresolution&component=directx-d3dx9&component=
> directx-d3dx10&keywords=download&order=bug_id%20DESC
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