amnesia's dbus.service killed due to OOM when logging in
I just ran the `Dotfiles persistence` scenario (the only potentially relevant bit from that is that activating persistence could be related) on my system and it failed while logging in due to `dbus.service` being OOM reaped:
```
Oct 24 09:55:37 amnesia systemd-oomd[894]: Considered 40 cgroups for killing, top candidates were:
Oct 24 09:55:37 amnesia systemd-oomd[894]: Path: /user.slice/user-1000.slice/user@1000.service/session.slice/dbus.service
Oct 24 09:55:37 amnesia systemd-oomd[894]: Memory Pressure Limit: 0.00%
Oct 24 09:55:37 amnesia systemd-oomd[894]: Pressure: Avg10: 20.61 Avg60: 5.29 Avg300: 1.18 Total: 3s
Oct 24 09:55:37 amnesia systemd-oomd[894]: Current Memory Usage: 141.4M
Oct 24 09:55:37 amnesia systemd-oomd[894]: Memory Min: 0B
Oct 24 09:55:37 amnesia systemd-oomd[894]: Memory Low: 0B
Oct 24 09:55:37 amnesia systemd-oomd[894]: Pgscan: 3482
Oct 24 09:55:37 amnesia systemd-oomd[894]: Last Pgscan: 1244
[...]
Oct 24 09:55:37 amnesia systemd[8024]: dbus.service: systemd-oomd killed 23 process(es) in this unit.
Oct 24 09:55:37 amnesia systemd[8024]: dbus.service: Main process exited, code=killed, status=9/KILL
```
The result is that we get stuck in the GDM session (but the Welcome Screen exits without issue).
[Full journal](/uploads/e2f80e7e88c715897bb7849c37477555/journal)
issue