I suspect these are all cause by the same issue:

https://issues.jboss.org/issues/?jql=text%20~%20%22XTS%20Test%20Hang%22%20and%20fixVersion%20%3D%20%225.0.0.m3%22

I did a stack dump (kill -quit <pid>) on all the java processes, so you can see what the threads where doing when the job hung. The stack dump is sent to the log for each proces.

If you find out that they are the same issue, can you close them as duplicates and do all work against this issue.