--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.test/src/org/graalvm/compiler/hotspot/test/HotSpotMonitorValueTest.java	2017-02-15 16:59:27.276842085 -0800
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2011, 2016, 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.
+ */
+package org.graalvm.compiler.hotspot.test;
+
+import static org.hamcrest.CoreMatchers.not;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+
+import org.graalvm.compiler.code.CompilationResult;
+import org.graalvm.compiler.core.test.GraalCompilerTest;
+import org.graalvm.compiler.debug.GraalError;
+
+import jdk.vm.ci.code.BytecodeFrame;
+import jdk.vm.ci.code.InstalledCode;
+import jdk.vm.ci.code.StackLockValue;
+import jdk.vm.ci.code.site.Call;
+import jdk.vm.ci.code.site.Infopoint;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+public class HotSpotMonitorValueTest extends GraalCompilerTest {
+
+    @Override
+    protected InstalledCode addMethod(ResolvedJavaMethod method, CompilationResult compResult) {
+        for (Infopoint i : compResult.getInfopoints()) {
+            if (i instanceof Call) {
+                Call call = (Call) i;
+                if (call.target instanceof ResolvedJavaMethod) {
+                    ResolvedJavaMethod target = (ResolvedJavaMethod) call.target;
+                    if (target.equals(lookupObjectWait())) {
+                        BytecodeFrame frame = call.debugInfo.frame();
+                        BytecodeFrame caller = frame.caller();
+                        assertNotNull(caller);
+                        assertNull(caller.caller());
+                        assertDeepEquals(2, frame.numLocks);
+                        assertDeepEquals(2, caller.numLocks);
+                        StackLockValue lock1 = (StackLockValue) frame.getLockValue(0);
+                        StackLockValue lock2 = (StackLockValue) frame.getLockValue(1);
+                        StackLockValue lock3 = (StackLockValue) caller.getLockValue(0);
+                        StackLockValue lock4 = (StackLockValue) caller.getLockValue(1);
+
+                        List<StackLockValue> locks = Arrays.asList(lock1, lock2, lock3, lock4);
+                        for (StackLockValue lock : locks) {
+                            for (StackLockValue other : locks) {
+                                if (other != lock) {
+                                    // Every lock must have a different stack slot
+                                    assertThat(lock.getSlot(), not(other.getSlot()));
+                                }
+                            }
+                        }
+                        assertDeepEquals(lock3.getOwner(), lock4.getOwner());
+                        assertThat(lock1.getOwner(), not(lock2.getOwner()));
+                        return super.addMethod(method, compResult);
+                    }
+                }
+            }
+        }
+        throw new AssertionError("Could not find debug info for call to Object.wait(long)");
+    }
+
+    private ResolvedJavaMethod lookupObjectWait() {
+        try {
+            return getMetaAccess().lookupJavaMethod(Object.class.getDeclaredMethod("wait", long.class));
+        } catch (Exception e) {
+            throw new GraalError("Could not find Object.wait(long): %s", e);
+        }
+    }
+
+    @Test
+    public void test() {
+        test("testSnippet", "a", "b");
+    }
+
+    private static void locks2(Object a, Object b) throws InterruptedException {
+        synchronized (a) {
+            synchronized (b) {
+                a.wait(5);
+            }
+        }
+    }
+
+    public static void testSnippet(Object a, Object b) throws InterruptedException {
+        synchronized (a) {
+            synchronized (a) {
+                locks2(a, b);
+            }
+        }
+    }
+}