Comment 47 for bug 1886277

mainline 5.4.60-050460-generic #202008210836 did indeed fix the setup for me, I just forget to get back to you guys here.

Hello Martin,
It looks like the fix had not been included in the 5.4.0-47 release, but only in the following 5.4.0-48 release.

Have you had the time to update to the updated kernel included with Ubuntu 20.04 and see if it has been fixed for you?

On a possibly connected note, may I ask you how you are mounting the nfs share on the client?
My server: Linux storage 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2+deb10u1 (2020-06-07) x86_64 GNU/Linux with nfs-kernel-server 1:1.3.4-2.5+deb10u1.

I switched from mounting the drives via fstab to a systemd mount after 14.04 with the following options: _netdev,sec=krb5p,vers=4.1,auto
I have to use NFS4.1 with vers=4.1, because whenever I omit it, the client will still freeze when a file is being copied or cut (Ctrl+C/X).
Do you run into the same issue and has this been fixed for you on 5.4.0-48 as well?

Kind regards,
Marc