This is very similar to 327cd2d3db:
If emergency.target is started while initrd-cleanup.service/start is queued,
the initrd-cleanup job did not get canceled. In parallel to the emergency
units, it eventually runs the service, which in turn isolates and starts
initrd-switch-root.target. This stops the emergency units and effectively
starts the initrd boot process again, which likely fails again like the
initial attempt. The system is thus stuck in a loop, never really reaching
emergency.target.
This can be triggered if a service in between initrd-parse-etc.service
and initrd.target fails.
With this conflict added, starting emergency.target automatically cancels
initrd-cleanup.service/start, avoiding the loop.
System and Service Manager
Details
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