At the (otherwise successful) completion of a rawhide install from an NFS tree, anaconda will hang while trying to unmount its filesystems before rebooting. I suspect this is due to NetworkManager bringing down the network before we get a chance to unmount the NFS share. I haven't been able to get any log info, since we're shutting down at that point - no shell access anymore.
Note I have a bug open about hanging on reboot after a successfull install when using an iscsi disk during the install, these 2 are most likely related, see bug 461838.
This will be fixed in the next build of anaconda.