java/net/DatagramSocket/PortUnreachable.java fails intermittently with Address already in use.

----------System.err:(31/1840)----------
java.net.BindException: Address already in use
at java.net.PlainDatagramSocketImpl.bind0(Native Method)
at java.net.AbstractPlainDatagramSocketImpl.bind(AbstractPlainDatagramSocketImpl.java:94)
at java.net.DatagramSocket.bind(DatagramSocket.java:394)
at java.net.DatagramSocket.<init>(DatagramSocket.java:244)
at java.net.DatagramSocket.<init>(DatagramSocket.java:301)
at java.net.DatagramSocket.<init>(DatagramSocket.java:273)
at PortUnreachable.serverSend(PortUnreachable.java:52)
at PortUnreachable.execute(PortUnreachable.java:87)
at PortUnreachable.main(PortUnreachable.java:101)
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:502)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:745)
java.net.SocketTimeoutException: Receive timed out
at java.net.PlainDatagramSocketImpl.peekData(Native Method)
at java.net.DatagramSocket.receive(DatagramSocket.java:745)
at PortUnreachable.execute(PortUnreachable.java:92)
at PortUnreachable.main(PortUnreachable.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:502)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: java.net.SocketTimeoutException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.net.SocketTimeoutException: Receive timed out