Looks similar to https://github.com/grpc/grpc/issues/14258 . Have you tried 
setting GRPC_ENABLE_FORK_SUPPORT=FALSE as described in 
https://github.com/grpc/grpc/issues/14056 ?

On Monday, February 12, 2018 at 10:50:05 PM UTC-8, ascani...@gmail.com 
> (gdb) py-bt
> #4 Waiting for a lock (e.g. GIL)
> #11 Frame 0x30654e0, for file 
> /usr/local/lib/python2.7/site-packages/grpc/_channel.py, line 475,
>  in _blocking (self=<_UnaryUnaryMultiCallable(_managed_call=<function at 
> remote 0x3080320>, _request_serializer=<met
> hod_descriptor at remote 0x2f40ab8>, _channel=<grpc._cython.cygrpc.Channel 
> at remote 0x2ffde10>, _response_deseriali
> zer=<built-in method FromString of GeneratedProtocolMessageType object at 
> remote 0x2eec1c0>, _method='/
> Service/Retrieve') at remote 0x307cbd0>, request=<RetrieveRequest at 
> remote 0x3080230>, ti
> meout=None, metadata=None, credentials=None, state=<_RPCState(code=None, 
> due=set([0, 1, 2, 4, 5, 6]), callbacks=[], 
> trailing_metadata=None, cancelled=False, initial_metadata=None, 
> response=None, condition=<_Condition(_Condition__loc
> k=<_RLock(_Verbose__verbose=False, _RLock__owner=None, 
> _RLock__block=<thread.lock at remote 0x2f68930>, _RLock__coun
> t=0) at remote 0x307cc90>, acquire=<instancemethod at remote 0x2f64780>, 
> _is_owned=<instancemethod a...(truncated)
>     self._method, None, deadline)

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