title: error: Unable to fully sync the tree while cloning AOSP
body: <p>Downloading android-8.1.0_r20. After downloading 45gb this error occurs.</p>
  <p>Error message in the terminal:</p>
  <pre><code>error: libcore/: platform/libcore checkout ed54621bf38a761388fe5ea56d71c64befaa9f40 
  error: Cannot checkout platform/libcore
  Checking out: 100% (592/592), done in 15m55.329s
  error: Unable to fully sync the tree.
  error: Checking out local projects failed.
  Failing repos:
  external/libunwind
  external/kmod
  frameworks/compile/slang
  external/autotest
  libcore
  Try re-running with &quot;-j1 --fail-fast&quot; to exit at the first error.
  </code></pre>
  <p>The source link of this git tag
  <a href="https://android.googlesource.com/platform/libcore/+/refs/tags/android-8.1.0_r20" rel="nofollow noreferrer">https://android.googlesource.com/platform/libcore/+/refs/tags/android-8.1.0_r20</a></p>
  <p>Can anyone please tell me how to resolve this?</p>