Proxmox 8.03 mount.cifs problem

[ISimic]

H all,
Recently I upgraded my proxmox server from version 7.4-15 to 8.0.3.
So far, everything works ok except one detail related to CIFS.
For backups I use old NAS which runs outdated software impossible to update.

To mount I use following command:

sudo mount -t cifs --verbose -o username=backupusr,password=redacted,vers=1.0,sec=ntlmv2 //nas1/bkpbase /mnt/bkpmount

This works on all my systems, some of them even runs kernel 6.3.10. This worked also in proxmox 7.
But now, in proxmox 8.0.3 I am unable to mount:

$ sudo mount -t cifs --verbose -o username=backupusr,password=redacted,vers=1.0,sec=ntlmv2 //nas1/bkpbase /mnt/bkpmount
[sudo] password for igor:
mount.cifs kernel mount options: ip=10.1.1.15,unc=\\nas1\bkpbase,vers=1.0,sec=ntlmv2,user=backupusr,pass=********
mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)

Dmesg shows:

[ 9364.862038] Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers
[ 9364.862060] CIFS: VFS: Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers
[ 9364.862075] CIFS: Attempting to mount \\nas1\bkpbase
[ 9364.898129] CIFS: VFS: cifs_mount failed w/return code = -5

I installed on this proxmox host proxmox 7.4-15 in VM and in it mount command works!!!
It looks to me like some kind kernel problem in 8.03 (kernel is: 6.2.16-3-pve #1 SMP PREEMPT_DYNAMIC PVE 6.2.16-3 (2023-06-17T05:58Z) x86_64 GNU/Linux)
Do I missing something?

Best regards,

 

[ISimic]

It is the kernel problem!
I installed 6.1.10-1-pve (6.1.10-1-pve #1 SMP PREEMPT_DYNAMIC PVE 6.1.10-1 (2023-02-07T13:10Z) x86_64 GNU/Linux)
and same mount command works without problem, while with 6.2.16-3-pve not working.

Filed bug report #4817

 

[willief]

Change NAS to the latest SMB3. It works with me.