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Ah, submit a new task after the manager shutdown fails with OSError(32, 'Broken pipe'). Example:
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from multiprocessing.managers import BaseManager
class MathsClass(object):
 def foo(self):
 return 42
class MyManager(BaseManager):
 pass
MyManager.register('Maths', MathsClass)
if __name__ == '__main__':
 manager = MyManager()
 manager.start()
 maths = manager.Maths()
 maths.foo()
 manager.shutdown()
 try:
 maths.foo()
 finally:
 manager.shutdown()
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This example doesn't hang, but this issue is about concurrent.futures, not multiprocessing.