This happened twice in same binaries run for jdk9 promotion b46. By querying test history, it seems to be a new failure. This is rare, twice out of 81 runs

Please refer to the test output below. lockName is unexpected to be null.

----------System.out:(11/294)----------
testBlockingOnSimpleMonitor
Lock1 = java.lang.Object@2a8a021c
[LockerThread obtained Lock1]
testBlocked: [2, 0, java.lang.Object@2a8a021c]
OK

testBlockingOnNestedMonitor
Lock1 = java.lang.Object@d443c99
Lock2 = java.lang.Object@2c1c17b2
[LockerThread obtained Lock1]
testBlocked: [1, 0, null]
----------System.err:(15/860)----------
java.lang.NullPointerException
at SynchronizationStatistics.testBlocked(SynchronizationStatistics.java:403)
at SynchronizationStatistics.testBlockingOnNestedMonitor(SynchronizationStatistics.java:166)
at SynchronizationStatistics.main(SynchronizationStatistics.java:63)
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:498)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: java.lang.NullPointerException