Hi,
I have spent days finding the reason for PowerPoint 2000 causing a deadlock if a file is opened that contains a preview which itself contains a bitmap >90x90 pixels (ie. on the first slide). After inserting some more traces I feel I am pretty close but I'm stuck now. The problem is connected to GDI's StretchBlt (bitblt.c). It calls MFDRV_StretchBlt and then the trouble begins as can be seen from the output:
<snip> trace:bitblt:StretchBlt --Start-- trace:gdi:GDI_GetObjPtr (0x3b0c): enter 1 trace:dc:DC_GetDCPtr trace:gdi:GDI_ReleaseObj (0x3b0c): leave 1 trace:gdi:GDI_GetObjPtr (0x3aec): enter 1 trace:dc:DC_GetDCPtr trace:gdi:GDI_GetObjPtr (0x3b0c): enter 2 trace:dc:DC_GetDCPtr trace:bitblt:StretchBlt 0x3aec 0,0 160x120 -> 0x3b0c 0,0 960x720 rop=cc0020 trace:gdi:GDI_GetObjPtr (0x3aec): enter 3 trace:dc:DC_GetDCPtr trace:gdi:GDI_ReleaseObj (0x3aec): leave 3 trace:gdi:GetObjectW 0x3af8 24 0x7fc2f760 trace:gdi:GDI_GetObjPtr (0x3af8): enter 3 trace:gdi:GDI_ReleaseObj (0x3af8): leave 3 trace:gdi:GDI_GetObjPtr (0x3aec): enter 3 trace:dc:DC_GetDCPtr trace:gdi:GDI_ReleaseObj (0x3aec): leave 3 trace:gdi:GDI_GetObjPtr (0x3aec): enter 3 trace:dc:DC_GetDCPtr trace:gdi:GDI_ReleaseObj (0x3aec): leave 3 trace:gdi:GDI_GetObjPtr (0x3aec): enter 3 trace:dc:DC_GetDCPtr trace:gdi:GDI_ReleaseObj (0x3aec): leave 3 trace:metafile:MFDRV_StretchBlt MF_StretchBltViaDIB->len = 20292 rop=cc0020 PixYPM=3780 Caps=96 trace:bitmap:GetDIBits trace:dc:CreateCompatibleDC --Checking lock-- hdc=0x3aec err:syslevel:_CheckNotSysLevel Holding lock 0x7fad49e0 level 3 </snip>
Yes well... hdcDst and hdcSrc aren't freed yet from within StretchBlt. There is this comment "FIXME: there is a race condition here"... is that the cause? Btw. this might be the same problem as bug #3125.
Can somebody give me a hint on how to tackle this? If you need more output please let me know.
Thanks a lot, Cihan