java/util/concurrent/locks/ReentrantLock/CancelledLockLoops.java test failed with 'Completed != 2'

TESTFAIL:java/util/concurrent/locks/ReentrantLock/CancelledLockLoops.java

The following test:

java/util/concurrent/locks/ReentrantLock/CancelledLockLoops.java

failed with message:

java.lang.Error: Completed != 2
at CancelledLockLoops$ReentrantLockLoop.test(CancelledLockLoops.java:119)
at CancelledLockLoops.main(CancelledLockLoops.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:623)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:713)

Unfortunately, the test does not print the 'completed' variable value.

It's not clear if it is a test bug or bug in the java.util.concurrent library. The bug seems to occur rarely. I was not able to reproduce it.

Possible product bugs:
 - Thread.interrupt() was not delivered to a thread
 - Variable named 'completed' was not shared with other threads after update and lock.unlock() operation
 - other reasons??

Possible test bugs:
 - one of the test threads managed to complete before the test interrupted it (at line 98)