I ran the crash recovery tests 3 times, they all hung at different times. It wasn't clear to me what the server was doing when it hung. For example, it wasn't being polled for a crash, or re-attempting recovery in a cycle. The problem can be recreated by running all the tests in one go:
cd ./XTS/sar/crash-recovery-tests mvn test
I tried running each JUnit test one at a time, and none of them hung. This can be done as follows:
for i in $(ls src/test/java/com/arjuna/qa/junit/Test*); do TEST=$(echo $i | awk -F '.' '{ print $1 }' | sed 's/\//\./g' | cut -c 15-); mvn test -Dtest=$TEST; done cat target/surefire-reports/*.txt | grep "Tests run"