title: Debug "exc_bad_access" with NSZombie
body: <p>I try to debug "exc_bad_access" with NSZombie. Those errors come from sqlite3. 
  I already enabled zombie objects in xCode / editScheme/ Diagnostics.
  Running the app with Instruments (Zombies) show this message in Console frame:</p>
  
  <pre><code>(1330,0x2581000) malloc: *** error for object 0x4c3ea00: non-page-aligned, non-allocated  pointer being freed
  *** set a breakpoint in malloc_error_break to debug
  &lt;End of Run&gt;
  </code></pre>
  
  <p>My question is how to find the object who cause that (here: 0x4c3ea00) ? If you know another way to work with NSZombie, please let me know. Thanks </p>