Looks like this buildbot timed out, giving a false positive build failure:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-android/builds/35744
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-android/builds/35745
Vitaly - could you look into whether this is regularly happening? If the buildbot resources or timeout could be increased to reduce such false positives?