troubleshooting unresponsive pyro processes

I recently learned about Pyro and am very excited about using it for a
current project.  However I have hit a roadblock.  After some
troubleshooting, here is my situation:

My domain code works reliably if I execute it in the absence of Pyro.  This
code uses another library (C extension) that creates a worker thread.  When
I create an instance of my domain model and sit in a simple event loop,
this part of the code works reliably (in particular, doing network I/O).
 My goal is to use Pyro to monitor/control aspects of the I/O performed by
this code.

When I augment this code to run inside a Pyro server process, things get
flaky.  (I am currently using the multiplex server in order to narrow down
the possibilities.)  Initial connections from a Pyro client may work fine,
but within a few tries, both the client and server process will become
unresponsive (cannot ^C).  The pattern *seems* to be that this occurs after
the domain class has done some network I/O, and then a Pyro client
connects.  (Connections from a Pyro client before the network I/O seem to
work better, though maybe not 100%).

I have tried looking at what the threads are doing via the technique shown
at
http://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/-
however, the threads look OK:

Pyro server thread:

# ThreadID: 1078640640
File: "./migrate.py", line 162, in <module>
  main()
File: "./migrate.py", line 155, in main
  daemon.requestLoop()
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/core.py", line
717, in requestLoop
  self.transportServer.loop(loopCondition=condition)
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/socketserver/multiplexserver.py",
line 137, in loop
  polls=poll.poll(1000*Pyro4.config.POLLTIMEOUT)

Pyro client thread:

# ThreadID: 1074319360
File: "client.py", line 11, in <module>
  print simplePhone.getURI()
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/core.py", line
149, in __call__
  return self.__send(self.__name, args, kwargs)
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/core.py", line
271, in _pyroInvoke
  self.__pyroCreateConnection()
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/core.py", line
334, in __pyroCreateConnection
  msgType, flags, seq, data = MessageFactory.getMessage(conn, None)
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/core.py", line
566, in getMessage
  headerdata = connection.recv(cls.HEADERSIZE)
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/socketutil.py",
line 334, in recv
  return receiveData(self.sock, size)
File: "/usr/local/lib/python2.7/dist-packages/Pyro4/socketutil.py",
line 109, in receiveData
  data=sock.recv(size, socket.MSG_WAITALL)


I have tried looking at a localhost packet capture, but wasn't able to make
sense of the Pyro message exchanges (not surprising, but I was running out
of ideas).

I am using Pyro 4.17 on Linux.

Any ideas on what I should try next?

Many thanks,
Tom

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