[Bug 20380] Heroes of Might and Magic III hangs

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20380





--- Comment #55 from Roderick Colenbrander <thunderbird2k at gmail.com>  2009-12-27 10:43:01 ---
(In reply to comment #54)
> I can also reproduce this bug. I am using R600 GPU with OSS experimental
> drivers (everything, including XServer, from git masters). Is there any way I
> can help improving the situation? I'm a bit experienced programmer and I've
> already beaten one wine bug (#10610), but it took me a day :). Maybe some hints
> or something like that how can I help? I'll hopefully find some time to
> accomplish the task.
> 
> Could you remind me what is the direct cause of error (null access, weird
> library client behaviour) and where should I look for bad code? You said
> something about locking that's not done in some places as one of the reason of
> crash, didn't you?

To be honest since I haven't been able to reproduce the bug (I don't understand
anything about the game either) I'm not sure where it is. Another game has a
similar problem and it is a bit 'timing' related (perhaps some threading
issue). I suspect that the issue is triggered by BitBlt from x11_copy_to_screen
in wined3d. The bug is likely somewhere in the dibsection code which is mostly
in dlls/winex11.drv/dib.c / bitblt.c / xrender.c.

The issue is very hard to debug because we perform memory access tricks
throughout all dibsection code.

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