diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index f38f662..ee6f51e 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -60,6 +60,7 @@
 import com.android.launcher3.pm.PackageInstallInfo;
 import com.android.launcher3.pm.UserCache;
 import com.android.launcher3.shortcuts.ShortcutRequest;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.util.IntSet;
 import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.PackageUserKey;
@@ -346,6 +347,12 @@
     public void addCallbacks(Callbacks callbacks) {
         Preconditions.assertUIThread();
         synchronized (mCallbacksList) {
+            if (TestProtocol.sDebugTracing) {
+                Log.d(TestProtocol.NULL_INT_SET, "addCallbacks pointer: "
+                        + callbacks
+                        + ", name: "
+                        + callbacks.getClass().getName(), new Exception());
+            }
             mCallbacksList.add(callbacks);
         }
     }
diff --git a/src/com/android/launcher3/model/BaseLoaderResults.java b/src/com/android/launcher3/model/BaseLoaderResults.java
index 3cae1e1..d270cc5 100644
--- a/src/com/android/launcher3/model/BaseLoaderResults.java
+++ b/src/com/android/launcher3/model/BaseLoaderResults.java
@@ -177,7 +177,9 @@
             if (TestProtocol.sDebugTracing) {
                 Log.d(TestProtocol.NULL_INT_SET, "bind (1) currentScreenIds: "
                         + currentScreenIds
-                        + ", mCallBacks: "
+                        + ", pointer: "
+                        + mCallbacks
+                        + ", name: "
                         + mCallbacks.getClass().getName());
             }
             filterCurrentWorkspaceItems(currentScreenIds, mWorkspaceItems, currentWorkspaceItems,