This was observed in latest verona PIT regression testing by IDC.

Please see the following test output:
----------System.out:(4/90)----------

Test family=INET
dc1 joining [225.4.5.6]:57345 @ en0
dc2 joining [225.4.6.6]:57345 @ en0
----------System.err:(17/893)----------
java.net.SocketException: Exec format error
at sun.nio.ch.Net.joinOrDrop4(Native Method)
at sun.nio.ch.Net.join4(Net.java:513)
at sun.nio.ch.DatagramChannelImpl.innerJoin(DatagramChannelImpl.java:875)
at sun.nio.ch.DatagramChannelImpl.join(DatagramChannelImpl.java:893)
at Promiscuous.test(Promiscuous.java:169)
at Promiscuous.main(Promiscuous.java:213)
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)