ray: KeyError on returning an ActorHandle from an Actor method.

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Mac OS X
• Ray installed from (source or binary): pip
• Ray version: 0.2.2
• Python version: 3.6
• Exact command to reproduce: ray.get(actor1.get_actor2.remote())

Describe the problem

I get a KeyError when I try to return an ActorHandle from an ActorMethod. See the annotated logs below for details.

Source code / logs

Exception ignored in: <object repr() failed>
Traceback (most recent call last):
  File "/Users/DevinPetersohn/anaconda/envs/python36/lib/python3.6/site-packages/ray/actor.py", line 653, in __del__
    self._ray_actor_handle_id.id() == ray.worker.NIL_ACTOR_ID):
  File "/Users/DevinPetersohn/anaconda/envs/python36/lib/python3.6/site-packages/ray/actor.py", line 639, in __getattribute__
    return object.__getattribute__(self, attr)
AttributeError: 'ActorHandle' object has no attribute '_ray_actor_handle_id'

Is it possible that the dictionary serialization of the ActorHandle is causing this problem?

WARNING: Serializing objects of type <class 'ray.actor.ActorHandle'> by expanding them as dictionaries of their fields. This behavior may be incorrect in some cases.
WARNING: Serializing objects of type <class 'ray.signature.FunctionSignature'> by expanding them as dictionaries of their fields. This behavior may be incorrect in some cases.

I am able to print the actor handle out here, and as long as I don’t try to access anything inside the Actor, there is no problem with the rest of the code. When I do try to access something inside the actor, the code exits. No new errors are shown when it exits.

Actor(c9cdbeda27c4c646e398f4dfbc4f3bc2553032b2)
Traceback (most recent call last):
  File "g_main.py", line 33, in <module>
    print(ray.get(x.get_oid_dictionary.remote()))
  File "/Users/DevinPetersohn/anaconda/envs/python36/lib/python3.6/site-packages/ray/actor.py", line 419, in remote
    dependency=self.actor._ray_actor_cursor)
  File "/Users/DevinPetersohn/anaconda/envs/python36/lib/python3.6/site-packages/ray/actor.py", line 594, in _actor_method_call
    is_actor_checkpoint_method=is_actor_checkpoint_method)
  File "/Users/DevinPetersohn/anaconda/envs/python36/lib/python3.6/site-packages/ray/worker.py", line 516, in submit_task
    self.task_driver_id.id()][function_id.id()]
KeyError: b'\xfa\xb1\xdd3v\xbbz\xd4\xe1h\x0c\x1f\xe2O>\x07\xa1+,\xe1'

All of the logs above are repeated whether I try to access something inside the Actor or not.

Is this error due to problems rebuilding the ActorHandle?