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The "RuntimeError: maximum recursion depth exceeded" message is normally only triggered by pure Python recursion, so I would not have expected it here, but there should be some sort of graceful MemoryError or somesuch rather than a segfault.
The following code narrows it down to some issue in starmap():
 def gstarmap(func, iterable):
 for tup in iterable:
 yield func(*tup)
 def mylist(iterable):
 return [x for x in iterable]
 a = b = [1]
 for i in xrange(100000):
 # Things that trigger a segfault: 
 #a = starmap(add, izip(a, b)) 
 #a = starmap(add, iter( (a, b) )) 
 a = starmap(add, (a, b) )
 # Things that exit cleanly with a RuntimeError 
 #a = gstarmap(add, iter( (a, b) )) 
 #a = (x+y for x, y in iter( (a, b) )) 
 mylist(a)
One possibility may be that starmap.next needs to clear StopIteration exceptions in the same way as PyIter_Next():
 if (result == NULL &&
 PyErr_Occurred() &&
 PyErr_ExceptionMatches(PyExc_StopIteration))
 PyErr_Clear();