Traceback (most recent call last): File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/internet/defer.py", line 137, in maybeDeferred result = f(*args, **kw) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/buildbot/process/buildstep.py", line 399, in _start return RemoteCommand._start(self) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/buildbot/process/buildstep.py", line 116, in _start self.remote_command, self.args) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/pb.py", line 345, in callRemote _name, args, kw) --- <exception caught here> --- File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/pb.py", line 860, in _sendMessage netArgs = self.serialize(args, perspective=perspective, method=message) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/pb.py", line 814, in serialize return jelly(object, self.security, None, self) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/jelly.py", line 1110, in jelly return _Jellier(taster, persistentStore, invoker).jelly(object) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/jelly.py", line 522, in jelly sxp.extend(self._jellyIterable(tuple_atom, obj)) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/jelly.py", line 574, in _jellyIterable yield self.jelly(item) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/jelly.py", line 463, in jelly return obj.jellyFor(self) File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/flavors.py", line 127, in jellyFor return ["remote", jellier.invoker.registerReference(self)] File "/home/pypy-worker/pypy2.7-v7.3.22-linux64/site-packages/twisted/spread/pb.py", line 715, in registerReference raise Error("Maximum PB reference count exceeded. " twisted.spread.pb.Error: Maximum PB reference count exceeded. Goodbye.