There is a race with theKeyboardInterrupt exception in theasyncio.base_events.BaseEventLoop.run_forever() method. While an attempt is made to restore the environment to its previous state beforerun_forever() completes with atry...finally, a couple items find themselves outside thetry...finally. Specifically, a badly timedKeyboardInterrupt will mean that, neither theself._thread_id value or the hooks set bysys.set_asyncgen_hooks() will be correctly restored. Both of these should be moved inside thetry...finally.

This applies to all existing version of Python on all platforms.