Using the test framework at http://github.com/movitto/qmf/ we were able to cause the console to hang and require a SIGKILL to stop it by querying for > 450 or so objects.
in project_stress/stress_agent/src run:
./stress_agent -n 500
And in project_stress/ruby/bin run:
./console.rb -t testobject -s
If you try rerunning the agent with fewer objects you will see what normal output looks like.