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Python 3.2 will exit with a segmentation fault if a byte string is used as a field name in a subclass of ctypes.Structure.
Python 3.2.2 (default, Dec 18 2011, 18:56:20) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336100)] on darwin
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>>> import ctypes
>>> class Point(ctypes.Structure):
... _fields_ = ((b'x', ctypes.c_int), (b'y', ctypes.c_int))
... 
Segmentation fault: 11
This also occurs if None or an int is used as the field name.
I would expect that a TypeError exception would be raised if an attempt is made to use an invalid type for the field name.