Does "modprobe -v btrfs" print anything, or does the command fail
silently?
Gives no output. "lsmod|grep btrfs" shows nothing.
Is this with SELinux enforcing? If so, have you tried with enforcing=0
yet? (or run "setenforce 0" as root before trying modprobe and the other
commands.
I tried with enforcing off. No difference.
I'm thinking that the btrfs problem is a red herring. I masked both btrfs and NFS filesystems in /etc/fstab and rebooted. Now I get a very low-res KDE login screen (which of course doesn't do any good as /home is not mounted), but journalctl continues to show errors, in particular:
Unit var-lib-nfs-rpc_pipefs.mount has failed
Also, networking is off. I repeat, all NFS mounts are masked (commented out).