java/nio/file/WatchService/LotsOfEvents.java failed with java.lang.RuntimeException: Insufficient events

This is from 8u40 resman nightly.

Please refer to the following test output:
----------messages:(3/123)----------
command: main LotsOfEvents
reason: User specified action: run main/timeout=180 LotsOfEvents
elapsed time (seconds): 4.262
----------System.out:(0/0)----------
----------System.err:(15/838)----------
java.lang.RuntimeException: Insufficient events
at LotsOfEvents.drainAndCheckOverflowEvents(LotsOfEvents.java:126)
at LotsOfEvents.testOverflowEvent(LotsOfEvents.java:72)
at LotsOfEvents.main(LotsOfEvents.java:45)
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:497)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:745)