STINNER Victor added the comment:

It's better to use asyncio.get_event_loop() to create the event loop.
Otherwise, you have to create manually the child watcher:
https://docs.python.org/dev/library/asyncio-subprocess.html#subprocess-and-threads

If I recall correctly, you have to call asyncio. get_child_watcher().

What is your OS?

Maybe subprocess_exec/shell may ensure that a child watcher exist. Maybe
only in debug mode?

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<http://bugs.python.org/issue24837>
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