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CFMessagePort weirdness, szone_error, double-free?

I have a simple IPC server app, and it's generating the following error, deep inside RunApplicationEventLoop():

SSFilterServer(1716) malloc: *** error for object 0x317810: double free
SSFilterServer(1716) malloc: *** set a breakpoint in szone_error to debug

This is odd, in that szone_error is never called. (I finally had to set a breakpoint in malloc_printf to get it to break.) This warning message should be updated.

Also, the application event loop does absolutely nothing (or at least, nothing custom). The double-free happens after every IPC call into the app; the IPC entrypoint itself is just a placeholder and doesn't allocate or free anything, that I'm aware of. Any idea what could be causing the double-free?

Finally, I based my code on the Carbon CFMessagePort code from Apple's dev site:

http://developer.apple.com/documentation/Cocoa/Conceptual/ Multithreading/articles/SocketComm.html#//apple_ref/doc/uid/ TP40001479-BAJDDJGB

That page contains a function, MainThreadResponseHandler(), that is supposed to return a CFDataRef, but the sample code returns nothing. (XCode gives a warning.) For now I'm just returning the CFDataRef that's passed in... Is there a "correct" way to handle this?

Thanks,
Ben
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