My Arch linux laptop hangs 90 seconds during shutdown due to NFS client unmount timeouts. Networking on this machine is WiFi only, controlled via iwd and systemd-networkd. This is a day-one issue with iwd for me, and does not occur using wpa_supplicant. Digging into the logs, I see dbus being spontaneously killed prior to iwd gracefully disconnecting. This of course causes iwd to prematurely terminate, causing my NFS unmount hangs Mar 11 16:40:54 x360 iwd[465]: D-Bus disconnected, quitting... Mar 11 16:40:54 x360 iwd[465]: Removing scan context for wdev 2 Mar 11 16:40:54 x360 systemd[1]: Stopping D-Bus System Message Bus... Mar 11 16:40:54 x360 kernel: wlan0: deauthenticating from c6:**:1f:**:65:** by local choice (Reason: 3=DEAUTH_LEAVING) Mar 11 16:40:54 x360 systemd[1]: dbus.service: Succeeded. Mar 11 16:40:54 x360 systemd[1]: Stopped D-Bus System Message Bus. Mar 11 16:40:54 x360 audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=dbus comm="systemd" e> Mar 11 16:40:54 x360 systemd[1]: Unmounting /mnt/fast... Mar 11 16:40:54 x360 systemd-networkd[421]: wlan0: Link DOWN ... Mar 11 16:42:24 x360 systemd[1]: mnt-fast.mount: Unmounting timed out. Terminating. Mar 11 16:42:24 x360 systemd[1]: mnt-fast.mount: Mount process exited, code=killed, status=15/TERM Mar 11 16:42:24 x360 systemd[1]: mnt-fast.mount: Failed with result 'timeout'. The supplied iwd.service file does not specifically state dbus as a dependency. (It happens to work because dbus always started very early) I have corrected my shutdown hang issue using the following override: $ cat /etc/systemd/system/iwd.service.d/override.conf [Unit] BindsTo=dbus.service After=dbus.service