Hang when unmounting cifs filesystem.

[tutralex]

Armbianmonitor:

https://paste.armbian.com/siboxacixo

After upgrading to Armbian 26.2, I noticed that if I mounted a network drive (samba, cifs) and even accessed it, and then tried to unmount it (sudo umount -t cifs ...), the system would freeze. Upgrading from Debian 12 (bookworm) to Debian 13 (trixie) didn't help. I did a rollback to Armbian 25.x via backup, and this problem doesn't exist there.

[tutralex]

I tried various parameters when mounting and unmounting, such as: sudo umount -f /media/..., but the system still hangs. You can't connect to the device via SSH in a new session. If you force a reboot (or sudo systemctl poweroff ) without unmounting it, it won't happen, and you won't be able to connect via SSH. Physically disconnecting the cable also doesn't help.

Edited December 4 by tutralex

[IBV]

Hi,
how do you mount the share? It might be that systemd manages the mount in newer systems, then, to umount you have to simply

systemctl stop your-share.mount

You can check with:

systemctl list-units --type=mount --all

To see if the mount is systemd managed