title: gitk error: autorelease pool page corrupted
body: <p>Since this morning when I try to use gitk on a project with a git instance it gives me the below error. This never happened to me since today and I have used gitk for months now.</p>
  <p>The only difference I can point out is that this morning, during an attempt of installation of iStat to monitor my mac mini temperatures, I ran the command <code>sudo gem update --system</code> and I tried also to install rubygems-update. I don't know if there is any correlation.</p>
  <p>The specific error is this:</p>
  <pre><code>objc[1253]: autorelease pool page 0x7fe20e945000 corrupted
    magic     0x00000000 0x00000000 0x00000000 0x00000000
    should be 0xa1a1a1a1 0x4f545541 0x454c4552 0x21455341
    pthread   0x10f3ecdc0
    should be 0x10f3ecdc0
  
  [1]    1253 abort      gitk
  </code></pre>
  <p>Since I've downloaded it and git through home brew, I've tried to use brew doctor, brew cleanup [-d] [-v], brew unlink and relink, and updated both git and gitk.</p>
  <p>I'm using the following command line tool: 12.0.32.28</p>