--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java	Wed Jan 10 15:05:33 2018 -0800
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/code/TypeAnnotationPosition.java	Wed Jan 10 22:52:08 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -312,6 +312,7 @@
         Assert.check(!hasExceptionIndex(), "exception_index already set");
         Assert.check(exception_index >= 0, "Expected a valid index into exception table");
         this.exception_index = exception_index;
+        this.isValidOffset = true;
     }
 
     public boolean hasCatchType() {

--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Code.java	Wed Jan 10 15:05:33 2018 -0800
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/Code.java	Wed Jan 10 22:52:08 2018 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2100,15 +2100,19 @@
     }
 
     private void fillLocalVarPosition(LocalVar lv) {
-        if (lv == null || lv.sym == null || !lv.sym.hasTypeAnnotations())
+        if (lv == null || lv.sym == null || lv.sym.isExceptionParameter()|| !lv.sym.hasTypeAnnotations())
             return;
+        LocalVar.Range widestRange = lv.getWidestRange();
         for (Attribute.TypeCompound ta : lv.sym.getRawTypeAttributes()) {
             TypeAnnotationPosition p = ta.position;
-            LocalVar.Range widestRange = lv.getWidestRange();
-            p.lvarOffset = new int[] { (int)widestRange.start_pc };
-            p.lvarLength = new int[] { (int)widestRange.length };
-            p.lvarIndex = new int[] { (int)lv.reg };
-            p.isValidOffset = true;
+            if (widestRange.closed() && widestRange.length > 0) {
+                p.lvarOffset = new int[] { (int)widestRange.start_pc };
+                p.lvarLength = new int[] { (int)widestRange.length };
+                p.lvarIndex = new int[] { (int)lv.reg };
+                p.isValidOffset = true;
+            } else {
+                p.isValidOffset = false;
+            }
         }
     }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/T8187805/BogusRTTAForUnusedVarTest.java	Wed Jan 10 22:52:08 2018 -0500
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test 8187805
+ * @summary bogus RuntimeVisibleTypeAnnotations for unused local in a block
+ * @modules jdk.jdeps/com.sun.tools.classfile
+ *          jdk.compiler/com.sun.tools.javac.util
+ * @run main BogusRTTAForUnusedVarTest
+ */
+
+import com.sun.tools.classfile.*;
+
+import java.io.File;
+import java.lang.annotation.Target;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+import com.sun.tools.classfile.Attribute;
+import com.sun.tools.classfile.RuntimeVisibleTypeAnnotations_attribute;
+import com.sun.tools.classfile.TypeAnnotation;
+import com.sun.tools.classfile.TypeAnnotation.Position;
+import com.sun.tools.javac.util.Assert;
+
+public class BogusRTTAForUnusedVarTest {
+
+    class Foo {
+        void something() {
+            {
+                @MyAnno Object o = new Object();
+            }
+        }
+    }
+
+    @Target(ElementType.TYPE_USE)
+    @Retention(RetentionPolicy.RUNTIME)
+    @interface MyAnno {}
+
+    public static void main(String args[]) throws Throwable {
+        new BogusRTTAForUnusedVarTest().run();
+    }
+
+    void run() throws Throwable {
+        checkRTTA();
+    }
+
+    void checkRTTA() throws Throwable {
+        File testClasses = new File(System.getProperty("test.classes"));
+        File file = new File(testClasses,
+                BogusRTTAForUnusedVarTest.class.getName() + "$Foo.class");
+        ClassFile classFile = ClassFile.read(file);
+        for (Method m : classFile.methods) {
+            if (m.getName(classFile.constant_pool).equals("something")) {
+                for (Attribute a : m.attributes) {
+                    if (a.getName(classFile.constant_pool).equals("Code")) {
+                        Code_attribute code = (Code_attribute)a;
+                        for (Attribute codeAttrs : code.attributes) {
+                            if (codeAttrs.getName(classFile.constant_pool).equals("RuntimeVisibleTypeAnnotations")) {
+                                throw new AssertionError("no RuntimeVisibleTypeAnnotations attribute should have been generated in this case");
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}