This script fails:

import numpy as np
import ctypes

sh = (1, 1)
tmp = np.zeros(sh, np.uint8)
test = ctypes.cast(ctypes.c_void_p(tmp.__array_interface__['data'][0]), ctypes.POINTER(ctypes.c_ubyte))
np.ctypeslib.as_array(test, sh)

python 3.4.2-dbg
numpy==1.10.1
Ubuntu 14.10

1. Under release python this code runs without crashes, because of disabled assertions
2. Under debug release python asserts failed:
   python3.4: ../Objects/abstract.c:2077: PyObject_Call: Assertion '(result != ((void *)0) && !PyErr_Occurred()) || (result == ((void *)0) && PyErr_Occurred())' failed.

Can you please explain why?

P.S. may be it can help:
If sh = (1, 1) change to sh = 239:

1. Release python will raise TypeError: shape must be a tuple
2. Debug python will also aborts