java/util/concurrent/ThreadPoolExecutor/ConfigChanges.java fails intermittently

#section:main
----------messages:(3/121)----------
command: main ConfigChanges
reason: User specified action: run main/othervm ConfigChanges
elapsed time (seconds): 0.605
----------System.out:(4/45)----------
22 not equal to 21

Passed = 32, failed = 1

----------System.err:(26/1446)----------
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1335)
at ConfigChanges.fail(ConfigChanges.java:233)
at ConfigChanges.fail(ConfigChanges.java:234)
at ConfigChanges.equal(ConfigChanges.java:239)
at ConfigChanges.realMain(ConfigChanges.java:202)
at ConfigChanges.main(ConfigChanges.java:241)
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:519)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:746)
java.lang.AssertionError: Some tests failed
at ConfigChanges.main(ConfigChanges.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:519)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:746)

JavaTest Message: Test threw exception: java.lang.AssertionError: Some tests failed
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.AssertionError: Some tests failed