jcristau added the comment:
This change in 2.7 seems to break things:
$ cat foo.pxd
cdef class B:
cdef object b
$ cat foo.pyx
cdef class A:
pass
cdef class B:
def __init__(self, b):
self.b = b
$ cat bar.py
from foo import A, B
class C(A, B):
def __init__(self):
B.__init__(self, 1)
C()
$ cython foo.pyx && gcc -I/usr/include/python2.7 -Wall -shared -fPIC -o foo.so
foo.c
$ python -c 'import bar'
Segmentation fault
C's tp_new is set to A's tp_new function, thus the b slot is never initialized
to Py_None, and C's __init__ calls DECREF on a NULL pointer.
Reverting changeset e7062dd9085e makes things work again, with C's tp_new being
B's tp_new.
----------
nosy: +jcristau
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<http://bugs.python.org/issue25731>
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