If udevd receives a uevent for a locked block device, then the event
is requeued. However, the queued event will be processed only when at
least one sd_event_source is processed. Hence, if udevd has no event
under processing, or receives no new uevent, etc., then the requeued
event will be never processed.
Follow-up for 400e3d21f8.
Fixes #24439.
System and Service Manager
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