diff --git a/test/626-const-class-linking/src/RacyLoader.java b/test/626-const-class-linking/src/RacyLoader.java
new file mode 100644
index 0000000..9c164a3
--- /dev/null
+++ b/test/626-const-class-linking/src/RacyLoader.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class RacyLoader extends DefiningLoader {
+    static {
+        // For JVM, register as parallel capable.
+        // Android treats all class loaders as parallel capable and makes this a no-op.
+        registerAsParallelCapable();
+    }
+
+    private Object lock = new Object();
+    private int index = 0;
+    private int count;
+
+    private DefiningLoader[] defining_loaders;
+
+    public RacyLoader(ClassLoader parent, int count) {
+        super(parent);
+        this.count = count;
+        defining_loaders = new DefiningLoader[2];
+        for (int i = 0; i != defining_loaders.length; ++i) {
+            defining_loaders[i] = new DefiningLoader(parent);
+        }
+    }
+
+    protected Class<?> findClass(String name) throws ClassNotFoundException
+    {
+        if (name.equals("Test") || name.equals("Test3")) {
+            throw new Error("Unexpected RacyLoader.findClass(\"" + name + "\")");
+        }
+        return super.findClass(name);
+    }
+
+    protected Class<?> loadClass(String name, boolean resolve)
+        throws ClassNotFoundException
+    {
+        if (name.equals("Test") || name.equals("Test3")) {
+            int my_index = syncWithOtherInstances(count);
+            Class<?> result = defining_loaders[my_index & 1].loadClass(name, resolve);
+            syncWithOtherInstances(2 * count);
+            return result;
+        }
+        return super.loadClass(name, resolve);
+    }
+
+    private int syncWithOtherInstances(int limit) {
+        int my_index;
+        synchronized (lock) {
+            my_index = index;
+            ++index;
+            if (index != limit) {
+                do {
+                    try {
+                        lock.wait();
+                    } catch (InterruptedException ie) {
+                        throw new Error(ie);
+                    }
+                } while (index < limit);
+            } else {
+                lock.notifyAll();
+            }
+        }
+        return my_index;
+    }
+}