title: Git failed to push some refs?
body: <p>We have a bare git repository hosted on sourcerepo.com.  Sometimes, when pushing, we get "error: failed to push some refs", but the push succeeds, and if anything's missing, it's not apparent what.  This is NOT the common problem where you have to pull before you can push; see:</p>
  
  <pre><code>2t2% git pull
  remote: Counting objects: 57, done.
  remote: Compressing objects: 100% (30/30), done.
  remote: Total 30 (delta 25), reused 0 (delta 0)
  Unpacking objects: 100% (30/30), done.
  From tiptap.sourcerepo.com:tiptap/2t2
     cb6c0e5..1dfea54  master     -&gt; origin/master
  Merge made by recursive.
   app/stylesheets/facebox.scss          |   11 +++
   app/stylesheets/screen.scss           |   28 ++++++--
   app/views/answers/tip_detail.html.erb |    2 +
   app/views/shared/_tip_box.html.erb    |   26 ++++---
   app/views/tip/tip_answer.js.erb       |   37 ++++++++++-
   config/application.rb                 |    2 +-
   public/javascripts/application.js     |    1 -
   public/javascripts/tip_animation.js   |  116 +++++++++++++++++++++++++++++++++
   public/stylesheets/facebox.css        |   11 +++
   9 files changed, 212 insertions(+), 22 deletions(-)
   mode change 100644 =&gt; 100755 app/views/shared/_tip_box.html.erb
   mode change 100644 =&gt; 100755 app/views/tip/tip_answer.js.erb
   mode change 100644 =&gt; 100755 config/application.rb
   mode change 100644 =&gt; 100755 public/javascripts/application.js
   create mode 100755 public/javascripts/tip_animation.js
  2t2% git push
  Counting objects: 18, done.
  Delta compression using up to 4 threads.
  Compressing objects: 100% (10/10), done.
  Writing objects: 100% (10/10), 1.54 KiB, done.
  Total 10 (delta 7), reused 0 (delta 0)
  To git@tiptap.sourcerepo.com:tiptap/2t2.git
     1dfea54..faf6014  master -&gt; master
  error: failed to push some refs to 'git@tiptap.sourcerepo.com:tiptap/2t2.git'
  </code></pre>
  
  <p>All of the discussion I can find about this error is either about the pull-before-you-push or about pack-objects dying; what does the error mean in the wild, and what should we do about it?</p>