Test java/rmi/Naming/UnderscoreHost.java does not work correctly when the given input URL is parsed without any exceptions. The test compares the host name that was used when the URL is parsed by the Naming utility and the host that is passed to a subsequent socket creation call (which is saved). These must match. However, a DGC dirty call causes the saved host information to be incorrectly overwritten. This particular code path was not exercised until the fix for CR 5085902.