This happened in jdk 9 dev nightly b89-2015-10-24 on Window 8 64 bit

Please refer to the following output:
----------System.out:(3/105)----------
Threads: 2 0.193019225s run time
Threads: 3 0.203666667s run time
Threads: 5 0.157275016s run time
----------System.err:(13/712)----------
java.lang.Error: Completed == 4; expected 2
at CancelledLockLoops$ReentrantLockLoop.test(CancelledLockLoops.java:116)
at CancelledLockLoops.main(CancelledLockLoops.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:520)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:747)