javax/net/ssl/templates/SSLSocketSSLEngineTemplate.java fails intermittently with "Unexpected EOF" message

javax/net/ssl/templates/SSLSocketSSLEngineTemplate.java test failed in JDK9/b19 Regression Tests Same Binaries Run (1 time during 139 run on linux-amd64 platform):

server unwrap: BUFFER_OVERFLOW/NOT_HANDSHAKING, 0/0 bytes
----
server wrap: OK/NOT_HANDSHAKING, 0/0 bytes
================
----------System.err:(14/782)----------
java.lang.Exception: Unexpected EOF
at SSLSocketSSLEngineTemplate.runTest(SSLSocketSSLEngineTemplate.java:254)
at SSLSocketSSLEngineTemplate.main(SSLSocketSSLEngineTemplate.java:157)
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:484)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:745)