title: Git push failed - unpack-objects abnormal exit
body: <p>I'm using remote git repository. I successfully commit my files and now I'm trying
  to push it up to stream.</p>
  
  <p>Operation fails with this messasge:</p>
  
  <pre><code>git.exe push --progress  "origin" master:master
  
  error: unpack failed: unpack-objects abnormal exit
  error: RPC failed; result=18, HTTP code = 200
  </code></pre>
  
  <p>I use TortoiseGit client on Windows 7.</p>
  
  <p>Why am I getting this message? how to recover from this state?</p>