--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/jsr292/RedefineMethodUsedByMultipleMethodHandles.java	Wed Nov 19 13:02:11 2014 -0500
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2014, 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
+ * @bug 8042235
+ * @summary redefining method used by multiple MethodHandles crashes VM
+ * @compile -XDignore.symbol.file RedefineMethodUsedByMultipleMethodHandles.java
+ * @run main RedefineMethodUsedByMultipleMethodHandles
+ */
+
+import java.io.*;
+import java.lang.instrument.*;
+import java.lang.invoke.*;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.management.*;
+import java.lang.reflect.*;
+import java.nio.file.*;
+import java.security.*;
+import java.util.jar.*;
+
+import javax.tools.*;
+
+import jdk.internal.org.objectweb.asm.*;
+
+public class RedefineMethodUsedByMultipleMethodHandles {
+
+    static class Foo {
+        public static Object getName() {
+            return "foo";
+        }
+    }
+
+    public static void main(String[] args) throws Throwable {
+
+        Lookup lookup = MethodHandles.lookup();
+        Method fooMethod = Foo.class.getDeclaredMethod("getName");
+
+        // fooMH2 displaces fooMH1 from the MemberNamesTable
+        MethodHandle fooMH1 = lookup.unreflect(fooMethod);
+        MethodHandle fooMH2 = lookup.unreflect(fooMethod);
+
+        System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
+        System.out.println("fooMH2.invoke = " + fooMH2.invokeExact());
+
+        // Redefining Foo.getName() causes vmtarget to be updated
+        // in fooMH2 but not fooMH1
+        redefineFoo();
+
+        // Full GC causes fooMH1.vmtarget to be deallocated
+        System.gc();
+
+        // Calling fooMH1.vmtarget crashes the VM
+        System.out.println("fooMH1.invoke = " + fooMH1.invokeExact());
+    }
+
+    /**
+     * Adds the class file bytes for {@code c} to {@code jar}.
+     */
+    static void add(JarOutputStream jar, Class<?> c) throws IOException {
+        String classAsPath = c.getName().replace('.', '/') + ".class";
+        jar.putNextEntry(new JarEntry(classAsPath));
+        InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath);
+
+        int b;
+        while ((b = stream.read()) != -1) {
+            jar.write(b);
+        }
+    }
+
+    static void redefineFoo() throws Exception {
+        Manifest manifest = new Manifest();
+        manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
+        Attributes mainAttrs = manifest.getMainAttributes();
+        mainAttrs.putValue("Agent-Class", FooAgent.class.getName());
+        mainAttrs.putValue("Can-Redefine-Classes", "true");
+        mainAttrs.putValue("Can-Retransform-Classes", "true");
+
+        Path jar = Files.createTempFile("myagent", ".jar");
+        try {
+            JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest);
+            add(jarStream, FooAgent.class);
+            add(jarStream, FooTransformer.class);
+            jarStream.close();
+            runAgent(jar);
+        } finally {
+            Files.deleteIfExists(jar);
+        }
+    }
+
+    public static void runAgent(Path agent) throws Exception {
+        String vmName = ManagementFactory.getRuntimeMXBean().getName();
+        int p = vmName.indexOf('@');
+        assert p != -1 : "VM name not in <pid>@<host> format: " + vmName;
+        String pid = vmName.substring(0, p);
+        ClassLoader cl = ToolProvider.getSystemToolClassLoader();
+        Class<?> c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl);
+        Method attach = c.getDeclaredMethod("attach", String.class);
+        Method loadAgent = c.getDeclaredMethod("loadAgent", String.class);
+        Method detach = c.getDeclaredMethod("detach");
+        Object vm = attach.invoke(null, pid);
+        loadAgent.invoke(vm, agent.toString());
+        detach.invoke(vm);
+    }
+
+    public static class FooAgent {
+
+        public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception {
+            assert inst.isRedefineClassesSupported();
+            assert inst.isRetransformClassesSupported();
+            inst.addTransformer(new FooTransformer(), true);
+            Class<?>[] classes = inst.getAllLoadedClasses();
+            for (int i = 0; i < classes.length; i++) {
+                Class<?> c = classes[i];
+                if (c == Foo.class) {
+                    inst.retransformClasses(new Class[]{c});
+                }
+            }
+        }
+    }
+
+    static class FooTransformer implements ClassFileTransformer {
+
+        @Override
+        public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+            if (Foo.class.equals(classBeingRedefined)) {
+                System.out.println("redefining " + classBeingRedefined);
+                ClassReader cr = new ClassReader(classfileBuffer);
+                ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_FRAMES);
+                ClassVisitor adapter = new ClassVisitor(Opcodes.ASM5, cw) {
+                    @Override
+                    public MethodVisitor visitMethod(int access, String base, String desc, String signature, String[] exceptions) {
+                        MethodVisitor mv = cv.visitMethod(access, base, desc, signature, exceptions);
+                        if (mv != null) {
+                            mv = new MethodVisitor(Opcodes.ASM5, mv) {
+                                @Override
+                                public void visitLdcInsn(Object cst) {
+                                    System.out.println("replacing \"" + cst + "\" with \"bar\"");
+                                    mv.visitLdcInsn("bar");
+                                }
+                            };
+                        }
+                        return mv;
+                    }
+                };
+
+                cr.accept(adapter, ClassReader.SKIP_FRAMES);
+                cw.visitEnd();
+                return cw.toByteArray();
+            }
+            return classfileBuffer;
+        }
+    }
+}