Hello,

My customers that recently upgraded to 10.8 on their MacPro suddenly started to 
have crashes that they never experienced before when running 10.7

Googling and searching the list archives, I just came upon a similar issue 
that's been reported on this list in august 2012.
I cannot find any solution posted on the list. Maybe the person who originally 
reported the bug (named Tamas Nagy) has found a solution outside of the list. 
If so, I would appreciate if he could share it with us.

Anyway, here's what happens:
My app draws a quartz composition in an overlay window on top of a window where 
a quicktime movie is playing.
The composition is playing inside a NSOpenGLContext. I don't use a QCView.

The composition rendering is done on the main thread with a timer firing every 
1/60th of second


Each crashlog looks the same :

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libGPUSupportMercury.dylib          0x067b3daf gldObjectPurgeable + 328
1   GLEngine                            0x0a7465d8 gleObjectPurgeable + 402
2   GLEngine                            0x0a663e0b glObjectPurgeableAPPLE_Exec 
+ 251
3   com.apple.QuartzComposer            0x93ca224f -[QCImageTextureBuffer 
setPurgeable:] + 348
4   com.apple.QuartzComposer            0x93c7758d -[QCCache(Internal) 
_runGarbageCollectionForSize] + 266
5   com.apple.QuartzComposer            0x93c7ca1d -[QCCache(Private) 
_collectResourcesForSize] + 73
6   com.apple.QuartzComposer            0x93c7ca88 -[QCProviderImageCache 
_collectResourcesForSize] + 85
7   com.apple.QuartzComposer            0x93c7c0a6 -[QCImageManager 
optimizeCaches] + 1644
8   com.apple.QuartzComposer            0x93c7b912 -[QCImageManager 
reclaimResources] + 243
9   com.apple.QuartzComposer            0x93c86fd5 -[QCGraphicsContext 
renderPatch:time:arguments:] + 164
10  com.apple.QuartzComposer            0x93c85fb3 -[QCOpenGLContext 
renderPatch:time:arguments:] + 552
11  com.apple.QuartzComposer            0x93c85d76 -[QCPatch(Runtime) 
render:arguments:] + 78
12  com.apple.QuartzComposer            0x93caccf2 -[QCRenderer 
renderAtTime:arguments:] + 57
13  XXXXXXXXXXXXXXX                      0x0001fc7a -[Schedule render:] + 206
14  com.apple.Foundation                0x949a57d4 __NSFireTimer + 117
15  com.apple.CoreFoundation            0x95eb69b6 
__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
16  com.apple.CoreFoundation            0x95eb6355 __CFRunLoopDoTimer + 709
17  com.apple.CoreFoundation            0x95e9b162 __CFRunLoopRun + 1730
18  com.apple.CoreFoundation            0x95e9a63a CFRunLoopRunSpecific + 378
19  com.apple.CoreFoundation            0x95e9a4ab CFRunLoopRunInMode + 123
20  com.apple.HIToolbox                 0x9501f15a RunCurrentEventLoopInMode + 
242
21  com.apple.HIToolbox                 0x9501eec9 ReceiveNextEventCommon + 374
22  com.apple.HIToolbox                 0x9501ed44 
BlockUntilNextEventMatchingListInMode + 88
23  com.apple.AppKit                    0x961e3a3a _DPSNextEvent + 724
24  com.apple.AppKit                    0x961e326c -[NSApplication 
nextEventMatchingMask:untilDate:inMode:dequeue:] + 119
25  com.apple.AppKit                    0x961d96cc -[NSApplication run] + 855
26  com.apple.AppKit                    0x9617c6f6 NSApplicationMain + 1053
27  XXXXXXXXXXX                      0x000028f5 start + 53


Of course this never happens on my machine... Maybe because I'm using an old 
iMac.

The crashes occur very often on new MacPros. The machines are up-to-date. 
Running 10.8.2 with all firmware updates applied.

Any hint / solution ?

Thanks
Jérome


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