FWIW, I get that error message on the following:
sage: cython("""
cdef int foo(int z) except -1:
return z
def bar(z):
return foo(z)
""")
sage: bar(-1)
---------------------------------------------------------------------------
SystemError Traceback (most recent call last)
/home/tom/sage-4.6.2.rc0/<ipython console> in <module>()
SystemError: error return without exception set
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