Android AdMob causes memory leak?

I've integrated AdMob v4.1.0 into my application and it seems to have caused a huge memory leak (pretty sure that it already happened on 4.0.4).

In order to isolate the problem I created a new project with a blank linear layout and added the AdView to it (this is actually a copy&paste from the sample code provided by AdMob). See my main.xml, MainActivity.java and manifest content:

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/linearLayout">
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

MainActivity.java:

package AdsTry.main;

import com.google.ads.AdRequest;
import com.google.ads.AdSize;
import com.google.ads.AdView;

import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;

public class MainActivity extends Activity {

    private final int AD_VIEW_ID = 1000000; 

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

         // Lookup R.layout.main
        LinearLayout layout = (LinearLayout)findViewById(R.id.linearLayout);

        // Create the adView
        // Please replace MY_BANNER_UNIT_ID with your AdMob Publisher ID
        AdView adView = new AdView(this, AdSize.BANNER, "MY_BANNER_UNIT_ID");
        adView.setId(AD_VIEW_ID);

        // Add the adView to it
        layout.addView(adView);

        // Initiate a generic request to load it with an ad
        AdRequest request = new AdRequest();

        adView.loadAd(request);           
    }

    @Override
    protect