The test case below "hangs" the JVM (as expected). The future task has not been submitted to any executor and so get() call blocks.

import java.util.concurrent.*;

public class f {
        public static void main(String[] args) throws Exception {
                FutureTask f = new FutureTask(new Callable() {
                        public Object call() {
                                return "jhvfdjg";
                        }
                });
                System.out.println(f.get());
        }
}

After JVM blocks, pressing ctrl-\ on Solaris (or ctrl-break on Windows) crashes JVM.
Please refer to the attached hs_errXXX files (on Solaris and Windows). In both platforms, the Java stack traces were printed and crash occurred after that. I used Mustang build-56 on both platforms.