Unreproducible SIOOBE. See:

http://deadlock.nbextras.org/hudson/job/release551/2286/console


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@2134 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/scm/CVSSCM.java

@@ -393,7 +393,10 @@ public class CVSSCM extends AbstractCVSFamilySCM implements Serializable {
                     actualCmd = cmd.clone();
                     actualCmd.add(modulePath.getName());
                     modulePath = modulePath.getParent();
-                    baseName = baseName.substring(0,baseName.lastIndexOf('/'));
+                    int slash = baseName.lastIndexOf('/');
+                    if (slash > 0) {
+                        baseName = baseName.substring(0, slash);
+                    }
                 }
 
                 if(!run(launcher,actualCmd,listener,