title: ctags never stops when I try to build a tag file for all python libraries
body: <p>I used to use ctags to generate a tags file for all installed python libraries by this command:</p>
  
  <pre><code>C:\Windows\System32&gt;ctags -R -f d:\home\vimfiles\python.ctags d:\Python26
  </code></pre>
  
  <p>But this morning, after I upgraded to Python 2.6.7, that command only generates the following output and never finishes its job.  The size of the tags file doesn't change anymore once it reaches about 11MB.</p>
  
  <pre><code>ctags: Warning: ignoring null tag in d:\Python26\Lib\copy.py
  ctags: Warning: ignoring null tag in d:\Python26\Lib\pickle.py
  ctags: Warning: ignoring null tag in d:\Python26\Lib\site-packages\django\contrib\admin\sites.py
  </code></pre>
  
  <p>What might cause this problem?</p>