I installed a fresh openSUSE 15.1 system (update repos during installation
enabled, server pattern selected) on a Laptop (Lenovo Thinkpad T440p).

This is a standard installation with btrfs.

After the latop rebooted into the new system, I tried to stop the system (sudo
halt) but that hangs forever:

[FAILED] Failed unmounting /var.
[FAILED] Failed unmounting opt.
[FAILED] Failed unmounting /.snapshots.
[  OK  ] Stopped target Local File Systems (Pre).
[  OK  ] Stopped Create Static Device Nodes in /dev.
[  OK  ] Stopped Remount Root and Kernel File Systems.
[  OK  ] Stopping Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or
progress polling.
[  OK  ] Stopped target Swap.
[  OK  ] Reached target Shutdown.


How it hangs....