TestTableShell times out when run in background

When starting maven in the backround, TestTableShell hangs.

mvn test -P runDevTests -Dtest.build.data.basedirectory=/ram2G -fn -pl hbase-shell -B:
pass

nohup mvn test -P runDevTests -Dtest.build.data.basedirectory=/ram2G -fn -pl hbase-shell -B
pass

nohup mvn test -P runDevTests -Dtest.build.data.basedirectory=/ram2G -fn -pl hbase-shell -B &
hangs
 
Tests run via maven shouldn't behave differently depending on whether maven runs in the foreground or background.

Technically, the test doesn't hang forver, it times out after 10000 seconds and fails.