There was a cut'n'paste error in the original change for CR 7098719. super.create(stream) should be reinstated.
After the above, now the (closed) regression test amended for CR 7098719 fails. The reason is that TwoStacksPlainSocketImpl overrides the close() method, from AbstractPlainSocketImpl, and does not decrements the ResourceManagers count. This problem existed before CR 7098719, it is just now being seen as the amended test catches this situation. The solution is to simply invoke ResourceManager.afterUdpClose() for non-stream sockets, just as is done in AbstractPlainSocketImpl.close().