Kagami Sascha Rosylight <sascha...@outlook.com> added the comment:

The argument-less instantiation also fails, which is worse.

```
>>> multiprocessing.Pool()
<multiprocessing.pool.Pool state=RUN pool_size=64>
>>> Exception in thread Thread-1:
Traceback (most recent call last):
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\threading.py", line 
973, in _bootstrap_inner
    self.run()
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\threading.py", line 
910, in run
    self._target(*self._args, **self._kwargs)
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\multiprocessing\pool.py",
 line 519, in _handle_workers
    cls._wait_for_updates(current_sentinels, change_notifier)
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\multiprocessing\pool.py",
 line 499, in _wait_for_updates
    wait(sentinels, timeout=timeout)
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\multiprocessing\connection.py",
 line 884, in wait
    ready_handles = _exhaustive_wait(waithandle_to_obj.keys(), timeout)
  File 
"C:\Users\sasch\AppData\Local\Programs\Python\Python39\lib\multiprocessing\connection.py",
 line 816, in _exhaustive_wait
    res = _winapi.WaitForMultipleObjects(L, False, timeout)
ValueError: need at most 63 handles, got a sequence of length 66
```

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45077>
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