Comment 2 for bug 475936

Thanks a lot for the workaround, I had the same problem here, now it works.
It also fixed a problem at bootup, where I sometimes got the message "/dev/mapper/crypttemp already mounted or /tmp busy", which resulted in mountall to fail, dropped into a root-shell and I needed to press CRTL-D to retry.
I think this bug may affect a lot of people who believe that /tmp is encrypted while it actually isn't.