Crashes with no backtrace when printing

FROM : Ben
DATE : Fri Jul 04 01:24:25 2008

I have just been getting my app to print two custom views. One uses a 
layer-backed NSView (many CALayer sublayers, in the region of 450-
ish), one a plain NSView. Sometimes (rarely, but often enough), with 
no apparent pattern, the app is crashing just before showing the print 
dialog. The problem is that the backtraces I get are more or less as 
follows :

Attaching to program: `/Path/goes/here', process 14859.
Cannot access memory at address 0x9ead7
Cannot access memory at address 0x9ead7
(gdb) bt
#0  0x0009ead3 in ?? ()
#1  0x0018ee80 in ?? ()
Cannot access memory at address 0x9ead7


A crashlog in the console said the following:

"image not found for lazy pointer at 0x973f014"


My debugging skills are not good enough to know how to work around 
this and find the source of the crash. I have GC enabled and 
originally thought than some required object was being collected, but 
after maintaining strong references to all the objects I use and it 
still happens, I'm not sure that's it.

The reason I thought having GC enabled may be the source is that these 
crashes are often accompanied by messages warning of collected objects 
having a non-zero refcount. I'm pretty certain these objects aren't 
ones I've personally allocated.

Anyway, that's all the pertinent info I can think of. Does anyone have 
any suggestions about how to start tracing the cause of these crashes?


Regards,

Ben