Libssl Segfaults on python3.6 With Threading

import ctypes
import logging

try:
    ssl_library = ctypes.cdll.LoadLibrary('libeay32.dll')
except Exception:
    ssl_library = ctypes.cdll.LoadLibrary('libssl.so')

def check_result(val, func, args):
    if val == 0:
        raise ValueError
    else:
        return ctypes.c_void_p(val)


# ssl_library.EC_KEY_new.restype = ctypes.c_void_p
ssl_library.EC_KEY_new_by_curve_name.restype = ctypes.c_void_p
ssl_library.EC_KEY_new_by_curve_name.errcheck = check_result

k = ssl_library.EC_KEY_new_by_curve_name(NID_secp256k1)

if ssl_library.EC_KEY_generate_key(k) != 1:
    raise Exception("internal error")
ssl_library.EC_KEY_free(k)