[Bug 2063381] [NEW] NFS Client can't mount via NFS version 4.0

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When specifying vers=4.0 or nfsvers=4.0 in NFSv4 mount options, the
client ends up using version 4.2 instead. This option seems to be
ignored.

This happens with pam_mount and manual mount. We have been using
pam_mount for years with the option vers=4.0, but now it appears to be
broken. Just recently noticed this is happening while troubleshooting
root causes of some other issues on our servers.

Test: mounting manually with option: minorversion=0, the client does not mount, no errors are seen with -vvv, no errors in logs either, it just fails silently. 
With pam_mount this option fails as well but is logged as mount failed into auth.log 
ex: Apr 24 17:15:22 servername sshd[666278]: (pam_mount.c:522): mount of /mnt/nfs/home/admin_username failed

I see that something similar was fixed in autofs, but this is not autofs
related. https://bugs.launchpad.net/bugs/1818121

Found a similar [oracle] issue but cannot read it=
https://support.oracle.com/knowledge/Oracle%20Linux%20and%20Virtualization/2528012_1.html

---

Description:    Ubuntu 20.04.6 LTS
Release:        20.04

---
util-linux:
  Installed: 2.34-0.1ubuntu9.6
  Candidate: 2.34-0.1ubuntu9.6
  Version table:
 *** 2.34-0.1ubuntu9.6 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.34-0.1ubuntu9 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages


mount:
  Installed: 2.34-0.1ubuntu9.6
  Candidate: 2.34-0.1ubuntu9.6
  Version table:
 *** 2.34-0.1ubuntu9.6 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.34-0.1ubuntu9 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages


nfs-common:
  Installed: 1:1.3.4-2.5ubuntu3.6
  Candidate: 1:1.3.4-2.5ubuntu3.6
  Version table:
 *** 1:1.3.4-2.5ubuntu3.6 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:1.3.4-2.5ubuntu3.3 500
        500 http://us.archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
     1:1.3.4-2.5ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: mount nfs
-- 
NFS Client can't mount via NFS version 4.0 
https://bugs.launchpad.net/bugs/2063381
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