bus_method_register_service() inserted the DnssdRegisteredService into m->dnssd_registered_services before assigning service->manager and before the sd_bus_track_new()/sd_bus_track_add_sender() calls, so if either failed, the destructor ran with service->manager still NULL, so its guarded hashmap_remove() was skipped and the freed service was left in the hashmap.
System and Service Manager
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