This failure has been observed once on Windows 7 x86 in jdk9 dev nightly testing (build 117_2016-05-03-1602_4946).

It is an intermittent failure. I tried 20 times with the same build on the same OS, but not reproduced

Test output:
----------messages:(4/227)----------
command: main -Dsun.net.inetaddr.ttl=20 DefaultCaching
reason: User specified action: run main/othervm/timeout=200 -Dsun.net.inetaddr.ttl=20 DefaultCaching
Mode: othervm [/othervm specified]
elapsed time (seconds): 21.381
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(15/992)----------
java.lang.RuntimeException: theclub:129.156.220.1: compare failed
at DefaultCaching.test(DefaultCaching.java:109)
at DefaultCaching.test(DefaultCaching.java:91)
at DefaultCaching.main(DefaultCaching.java:72)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:531)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-ea/Thread.java:804)