I have been experiencing this with version 3alpha, beta and not RC1 and finally decided to post it.
Everything works properly, ie there is no exceptions during startup. My beans work, I can deploy etc etc.
When I shutdown jboss by pressing CTRL-C it gets to a certain point and then my cursur becomes very slow and all the resources on the machine are tied up.
I was able to get a terminal window and found many many javac processes. I don't know if they are being spawned or if they existed. There seemed to be about 500.
I went like this
ps -edf | grep javac
If I kill any one of these processes the machine comes back to life and jboss exits.
If you need any information i will send it.
I believe it is 2.4.8 kernel and I don't have any other problems with the machine. I have 1 GIG of memory and 100 GB hard disk that is 10 % used. I also have 1.2 GB of swap space.
If you are interested in resolving it I can send more info.
PS: It isn't a real big deal for me because I just test my code on Linux and put it into production on a Windows 2000 server. I don't have the same problem on windows. My windows box is absolutely identical with the same memory, disk space, etc. etc.