Comment 46 for bug 537133

Thanks, that helped a lot. I was able to track this down to a combination of statd (which I already suspected) and idmapd (which I should have remembered from recent changes to the upstart jobs, but had forgotten about).

Changing statd to start on virtual-filesystems, and changing idmapd to not block the / mountpoint, gets us clear of the boot hang.

This is not a perfect fix because it means that anyone trying to do nfsroot over nfsv4 is out of luck; but it's strictly an improvement over the status quo, and it's been suggested that nfsroot doesn't actually work on nfsv4, so I'll go ahead with it for now.