In multiprocessing, attempting to add a Queue proxy to a dict or Namespace proxy (all returned by the same SyncManager) raises an exception indicating a keyword argument 'manager_owned=True' has been passed to the function AutoProxy() but is not an argument of that function.
In lib/python3.6/multiprocessing/managers.py, in function RebuildProxy(), line 873: "kwds['manager_owned'] = True" adds this argument to a keyword argument dictionary. This function calls AutoProxy which has an argument list defined on lines 909-910 as:
def AutoProxy(token, serializer, manager=None, authkey=None,
exposed=None, incref=True):
This raises an exception because there is no manager_owned argument defined. I added "manager_owned=False" as a keyword argument to AutoProxy which seems to have fixed the problem. There is no exception and I am able to pass Queue proxies through dict and Namespace proxies to other processes and use them. I don't know the purpose of that argument though or if the AutoProxy function should actually use it for something. My fix allows but ignores it.