InterruptibleIO is a Solaris-only feature which has been scheduled for removal. To maintain backward compatibility, the feature has been kept in our code base and conditioned by the UseVMInterruptibleIO VM flag. This flag has progressively been set to false by default, and then marked at deprecated. It's now time to completely remove this flag and get rid of the InterruptibleIO code.
JDK-4385444 for the full story.