title: MongoDB: Getting "Client Cursor::yield can't unlock b/c of recursive lock" warning when use findAndModify in two process instances
body: <p>I'm using:
  MongoDB 1.6.4, Python 2.6.6, PyMongo 1.9, Ubuntu 10.10</p>
  
  <p>I'm getting "Client Cursor::yield can't unlock b/c of recursive lock" 
  warning in my logs very often when use findAndModify in two process instances. 
  When I use only one process warning doesn't appear.</p>
  
  <p>How can I fix this?</p>
  
  <p>**Update 8 March 2013 **</p>
  
  <p>Is there a fix to this problem as of now?</p>