STINNER Victor <> added the comment:

It's easy to reproduce the issue on Linux:

diff --git a/Lib/test/test_asyncio/ 
index 11cd950df1..df4c2b9849 100644
--- a/Lib/test/test_asyncio/
+++ b/Lib/test/test_asyncio/
@@ -359,7 +359,7 @@ class EventLoopTestsMixin:
             called = True
         def run():
-            time.sleep(0.05)
+            time.sleep(1.0)
         f2 = self.loop.run_in_executor(None, run)

The problem is that BaseEventLoop.close() shutdowns its default executor  
without waiting:

    def close(self):
        executor = self._default_executor
        if executor is not None:
            self._default_executor = None

I fixed a similar issue in socketserver:

* bpo-31233: for socketserver.ThreadingMixIn
* bpo-31151: for socketserver.ForkingMixIn 
* bpo-33540: add block_on_close attr to socketserver

I suggest to wait by default, but maybe also add a block_on_close attribute to 
BaseEventLoop (default: False) just for backward compatibility.

What do you think Yury, Andrew, and Guido?

nosy: +gvanrossum

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