Hey David,
I just got around to looking at JBREM-1297 "Deadlock between MicroRemoteClientInvoker.establishLease and Client.notifyListeners", and I think that's what you're seeing in the thread dump. You want to take a look? I built a jboss-remoting.jar with the fix and attached it to JBREM-1297, if you want to give it a spin.
-Ron