title: How debug the issue of Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ffee1ba8578)
body: <p>I encounter the Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ffee1ba8578) error. </p>
  
  <p>As I know this cause from abnormal object release.</p>
  
  <p>But seem as stuck <code>[MTLModel description]</code> infinite loop. </p>
  
  <p><a href="https://i.stack.imgur.com/VqYzh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VqYzh.png" alt="enter image description here"></a></p>
  
  <p>Even already add one exception breakpoint in project and enable Zombie Objects in Edit Scheme, the console still without any information and output when error occurs.</p>
  
  <p>Is there any idea or experience for debugging.</p>