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Re: Crashes with no backtrace when printing
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Re: Crashes with no backtrace when printing


  • Subject: Re: Crashes with no backtrace when printing
  • From: Ben <email@hidden>
  • Date: Fri, 4 Jul 2008 07:55:21 +0100

Thanks for the tips Brian & Jen, using them I've now found that when the app crashes, there is a reference count underflow somewhere:

MyApp(15221,0xb0103000) malloc: reference count underflow for 0x14d6220, break on auto_refcount_underflow_error to debug.


Using the breakpoint above in the debugger enables me to get a more meaningful backtrace. I have uploaded screenshots of the first here, and the second is what happens when you continue from that point.


http://tinypic.com/view.php?pic=11tsk5g&s=3
http://tinypic.com/view.php?pic=zwdafs&s=3

It also generates this:

=shlibs-removed,shlib-info=[num="112",name="X20Function",kind="F",dyld- addr="0xb522000",reason="dyld",requested-state="E",state="E",path="/ Library/Printers/EPSON/InkjetPrinter/Libraries/X20Function.framework/ Versions/A/X20Function",description="/Library/Printers/EPSON/ InkjetPrinter/Libraries/X20Function.framework/Versions/A/ X20Function",loaded_addr="0xb522000",slide="0xb522000",prefix=""]


Now normally I wouldn't be arrogant enough to say that this is a bug in the frameworks or some other dependancy, but I cannot see a fault anywhere in my two methods within those traces. All the needed objects are still around at the end of printing, so nothing seems to be being collected. Could it be somewhere in the epson printer framework? The calls to PDEContent::InitDialog look like C++ to me and that's just voodoo as far as I'm concerned.
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