> Your comments do make sense. But the glitch lies in the code where it tries 
> to format a chunk of text with CTFrameSetter. I doubt it might have been 
> trapped into some infinite loop of  memory allocation in the implementation 
> of 
> CTFrameSetterCreateFrame, and that's the reason why it's allocating a memory 
> beyond boundary (but somehow 64-bit worked?).
Yes, I agree CoreText should not cause crashes even with huge documents that 
way.  That situation should be handled more gracefully.

Please file a bug against CoreText.

Thanks,

Aki_______________________________________________

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