smb mount fails with mount error(5): Input/output error

[vignesh-hbk]

What happened:

I have issues mounting a NetApp SMB share onto my ubuntu 22.04 machine using csi-smb-driver. The storage has AD auth enabled and with smbclient, I am able to connect and authenticate to the storage. However when I try to mount using CIFS or CSI-smb-driver, I am running into issues.

Smb logs :
E0120 09:59:29.001256 1 utils.go:81] GRPC error: rpc error: code = Internal desc = volume(smb-01-vol) mount "//xxxx/yyy" on "/var/lib/kubelet/plugins/kubernetes.io/csi/smb.csi.k8s.io/9b400ffc4472d1e8195452d738fac44a1ff7719ad65879f69fda6f55599971b1/globalmount" failed with mount failed: exit status 32
Mounting command: mount
Mounting arguments: -t cifs -o domain=fmee, //xxx/yyy /var/lib/kubelet/plugins/kubernetes.io/csi/smb.csi.k8s.io/9b400ffc4472d1e8195452d738fac44a1ff7719ad65879f69fda6f55599971b1/globalmount
Output: 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 log
[ 39.528383] kernel: FS-Cache: Netfs 'cifs' registered for caching
[ 39.638853] kernel: Key type cifs.spnego registered
[ 39.638869] kernel: Key type cifs.idmap registered
[ 39.639378] kernel: CIFS: Attempting to mount \xxx\yyy
[ 39.960848] kernel: kauditd_printk_skb: 53 callbacks suppressed
[ 39.960852] kernel: audit: type=1400 audit(1737111830.818:65): apparmor="DENIED" operation="capable" profile="/usr/sbin/cupsd" pid=1180 comm="cupsd" capability=12 capname="net_admin"
[ 40.188282] kernel: CIFS: VFS: \xxx\yyy Send error in SessSetup = -5
[ 40.189072] kernel: CIFS: VFS: cifs_mount failed w/return code = -5
[ 40.746703] kernel: audit: type=1400 audit(1737111831.602:66): apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed" pid=1259 comm="cups-browsed" capability=23 capname="sys_nice"
[ 44.913797] kernel: loop12: detected capacity change from 0 to 8 (edited)

What you expected to happen:

Mount to be successful

How to reproduce it:

Try mounting a SMB share on Ubuntu 22.04 using csi-smb driver.

Anything else we need to know?:

I am able to connect and authenticate and see the shares using smbclient on the same server. But when attempting to mount using CIFS or smb-driver, it fails with the below error.

Environment:

• CSI Driver version: v1.11.0
• Kubernetes version (use kubectl version): v1.31.3+k3s1
• OS (e.g. from /etc/os-release): Ubuntu 22.04

[vignesh-hbk]

PRETTY_NAME="Ubuntu 22.04.5 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.5 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy