Heh, this is weird. If the signal being removed is SIGTERM, the logic looks like it is definitely going to call signal.signal(signal.SIGTERM, signal.SIG_DFL). And it doesn't look like the signal module's globals have been eradicated yet (or you'd have gotten something like "TypeError: 'NoneType' object is not callable" instead).

You seem to be using Python 3.5.0.  Can you repro this with 3.5.1 or with the asyncio from github? Do you have a small self-contained program that repos it?