title: Jenkins sometime fails to auto-promote job
body: <p>I have really big net of jobs. Something Like this:
  Start job: A, job to promote: Z, Requires: E, F, G</p>
  
  <pre><code> A-------
  |  \     |
  B  C     D
  |   |   / \
  E   F  G   H 
  |   |  |   |
  I   J  K   L
  ============ &gt; if(E,F,G) then Promote Z
  </code></pre>
  
  <p>The question is: why it sometimes work? And sometimes( it seems on bigger jenkins load) I have to manually promote Z?</p>