java/util/concurrent/ScheduledThreadPoolExecutor/GCRetention.java starts failing intermittently recently (after JDK-8134853), very rare though.

----------System.out:(3/28)----------

Passed = 0, failed = 1

----------System.err:(23/1323)----------
java.lang.Error: references to 1/100 tasks retained ("leaked")
at GCRetention.test(GCRetention.java:116)
at GCRetention.instanceMain(GCRetention.java:133)
at GCRetention.main(GCRetention.java:131)
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$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:747)
java.lang.AssertionError: Some tests failed
at GCRetention.instanceMain(GCRetention.java:135)
at GCRetention.main(GCRetention.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:520)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:747)