I ran into this in an application I'm writing, and was able to isolate the problem in a very simple test case. It seems that passing a 'None' through an object slot across threads is the source of the issue. Just run the test case, and you'll see what I mean (assuming it's not platform specific).
"Segmentation fault: 11" caused by emitting None through an object slot between two threads
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    Cristian Maureira-Fredes 
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    Scott Maddox 
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