[Bug 16725] New: Intermittent deadlock in GDI32 between freetype_cs and GDI_Level

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=16725

           Summary: Intermittent deadlock in GDI32 between freetype_cs and
                    GDI_Level
           Product: Wine
           Version: 1.1.11
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: gdi32
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: Paul.Hampson at Pobox.com


Running the Warhammer Online patch client (warpatcher.bin) I occasionally see a
deadlock between freetype_cs and GDI_Level critical sections between two of the
threads.

It appears that one thread is in WineEngGetCharWidth holding freetype_cs, and
then calls GDI_AllocObject, descended from GetCharacterPlacementW called by
Gecko.

The other thread is in FONT_SelectObject, and then calls
WineEngCreateFontInstance, descended from a SelectObject call by libpatchui.dll
from warpatcher.bin.

This code in FONT_SelectObject is marked FIXME so I guess this is known as a
potential issue, but I can't see any bugs that specify this as a problem.

On the other hand, it looks to me like WineEngGetCharWidth should probably
somehow have tried to lock the GDI_Level critical section before entering the
freetype_cs critical section, if it is going to call things that might need to
lock GDI_Level.

In this case, the program is trying to display a HTML-skinned interface of some
kind. I'm not sure exactly what it's trying to do, but I can see how it'd have
gecko and GDI running on the same thing.

Bug 16310 comment 9 suggests that it might be being caused by the same thing,
but that's not confirmed there.


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