java/nio/channels/AsynchronousChannelGroup/Restart.java fails intermittently

----------System.err:(25/1924)----------
java.util.concurrent.ExecutionException: java.net.ConnectException: Connection refused
at sun.nio.ch.PendingFuture.get(java.base@9-ea/PendingFuture.java:183)
at Restart.testRestart(Restart.java:135)
at Restart.main(Restart.java:71)
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:537)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.lang.Thread.run(java.base@9-ea/Thread.java:844)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.UnixAsynchronousSocketChannelImpl.checkConnect(java.base@9-ea/Native Method)
at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishConnect(java.base@9-ea/UnixAsynchronousSocketChannelImpl.java:251)
at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(java.base@9-ea/UnixAsynchronousSocketChannelImpl.java:197)
at sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(java.base@9-ea/UnixAsynchronousSocketChannelImpl.java:212)
at sun.nio.ch.SolarisEventPort$EventHandlerTask.run(java.base@9-ea/SolarisEventPort.java:209)
at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(java.base@9-ea/AsynchronousChannelGroupImpl.java:112)
at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@9-ea/ThreadPoolExecutor.java:1161)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@9-ea/ThreadPoolExecutor.java:635)
at java.lang.Thread.run(java.base@9-ea/Thread.java:844)
at jdk.internal.misc.InnocuousThread.run(java.base@9-ea/InnocuousThread.java:122)

JavaTest Message: Test threw exception: java.util.concurrent.ExecutionException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.util.concurrent.ExecutionException: java.net.ConnectException: Connection refused