[Bug 9878] Most Steam games crash when starting/loading a game

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=9878





--- Comment #22 from Allan Tong <actong88 at gmail.com>  2007-10-17 00:41:30 ---
I find that if I pad the subheap header by 8 bytes, I no longer get the crash. 
In fact, making sure that the first free block in the subheap is 16 byte
aligned seems to fix the issue for me.  E.g. padding the subheap header by 8,
24, or 40 bytes fixes the problem, but if I pad by 16 or 32 bytes I still get
the crash.  FWIW the first free block used to be 16 byte aligned pre-patch.

In my case, there seems to be one heap allocation that's causing the problem. 
HL2 calls CreateVertexBuffer to create a 2MB buffer in the default memory pool
(D3DPOOL_DEFAULT), which as far as I understand means that it should be created
in video memory.  The current wine implementation ends up creating a 2MB buffer
in the process heap.  I've found that if I just make sure this one allocation
is 16 byte aligned, then I don't get the crash.  Is it possible that the game
is assuming a 16-byte aligned buffer?  Is that normal for a buffer allocated in
video memory?


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