Can you make a test code to introduce you issue?

I understand — it's not easy to extract failing code from your big project but please make simple example with python code and trivial C Extension for presentation of your problem.

Let's start from manual test can be reproduced by everyone. Also, please, make it for 'default' branch of python repo. It's possible to include bugfix for 2.7 but upcoming release the most important.

Thank you.