title: Crash on assigning NULL to a pointer in C++(Qtopia-Core-4.3.3) on Linux
body: <p>When,i try to assign null value to my pointer,it sometimes crashes on that line. The code is 
  something like this :</p>
  
  <pre><code>if(s_counter != NULL)
  {
      delete s_counter;
      s_counter = NULL; // it sometimes crashes here.
  }
  </code></pre>
  
  <p>This is not reproducable,100%,but it occurs frequently. Can anybody help in this?</p>