What were you trying to do that didn't work?

mount cifs share with krb5 certification. It's failed.

[root@kvm-02-guest23 ~]# mount //$SERVERS/cifs /mnt/testarea/client -o sec=krb5
mount error(22): Invalid argument
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
[root@kvm-02-guest23 ~]# 

[root@kvm-02-guest23 ~]# klist -e
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: root@RHQE.COM

Valid starting       Expires              Service principal
02/26/2025 22:02:23  02/27/2025 22:02:21  krbtgt/RHQE.COM@RHQE.COM
    renew until 03/05/2025 22:02:21, Etype (skey, tkt): aes256-cts-hmac-sha1-96, aes256-cts-hmac-sha1-96 
02/26/2025 22:02:24  02/27/2025 22:02:21  cifs/kvm-06-guest29.lab.eng.rdu2.dc.redhat.com@RHQE.COM
    renew until 03/05/2025 22:02:21, Etype (skey, tkt): aes256-cts-hmac-sha1-96, aes256-cts-hmac-sha1-96 
[root@kvm-02-guest23 ~]

What is the impact of this issue to you?

mount cifs with "-o sec=krb5" failed.

Please provide the package NVR for which the bug is seen:

samba-4.21.3-3.el9.x86_64

How reproducible is this bug?:

Steps to reproduce

1. mount //$SERVERS/cifs /mnt/testarea/client -o sec=krb5
2.  
3.  

Expected results

Actual results