issue with pycuda and multiprocessing

I created a simple gist that exposes an error for me on some machines and not others. It init's the driver, then spawns a child process and init's the driver there.
https://gist.github.com/wconstab/f06362277a6235aa87bdc4235bfde731

Running `py.test test_pycuda_multi.py` on some machines causes this error in the child process:

> LogicError: cuInit failed: initialization error

There are differences in [OS, docker being used or not, py2/3, nvidia driver] between the machines where this gist works or crashes, so I won't attempt to label it as specific to one configuration.

It would be helpful to know whether this should work or is expected to be undefined.