Comment 2 for bug 1685333

We have 7 occurrences so far with the stack overflow signature:
http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Fatal%20Python%20error%3A%20Cannot%20recover%20from%20stack%20overflow.%5C%22

TestRPC.test_cleanup_notification_transport_null : 3
TestRPC.test_cleanup : 2
TestRPC.test_cleanup_notifier_null: 1
TestRPC.test_clear_extra_exmods: 1

So this is most likely a problem in the TestRPC tests