I found that replacing nfsmount by mount in the initrd got it to work, (file scripts/casper line 209), got nfs-user-server working with live booting on nfs, so this a bug in nfsmount.
I found that replacing nfsmount by mount in the initrd got it to work,
(file scripts/casper line 209), got nfs-user-server working with live booting on nfs, so this a bug in nfsmount.