750e550eba362096d56a35104c6a32631aa67b8e
When the service is run in the initramfs, it is possible for it to get started and not be fast enough to exit before the root switch happens. It is started multiple times (depending on the consoles being detected), and runs asynchronously, so this is quite likely. It'll then get killed by killall(), and systemd will consider the service failed. To avoid all this, just wait for the service to terminate on it's own. Before=initrd-switch-root.target should be good for the initramfs, and Before=shutdown.tuarget should be good for the real system, although it's unlikely to make any difference there.
systemd - System and Service Manager
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