Comment 2 for bug 1073850

I have tested this with a newly created directory with a single file in it, and 'rmdir testx' exited with error 1, but 'rmdir --ignore-fail-on-non-empty testx' exited with 0 exit status, so I guess the 1 exit status on not being able to remove /tmp is not 'because a directory is non-empty' (cited from man), but maybe other errors too. I don't know however what could be causing it, as you are trying to run it with sudo, so permission issues should be out of the question.