The test hung because of an assertion failing before the threads were all joined: https://github.com/jbosstm/narayana/blob/master/ArjunaCore/arjuna/tests/classes/com/hp/mwtests/ts/arjuna/objectstore/CachedTest.java#L120

No state found while trying to read 0:ffffac110012:863a:5d7bfbf4:11
Thread for 0:ffffac110012:863a:5d7bfbf4:11 failed
Was in the output (no other errors)