Yu Watanabe
8a9ce525d1
Usually, removing non-existing addresses, routes, and etc, are safe. However, when multiple interfaces lost their carriers simultaneously, then manager_drop_routes() and manager_drop_nexthop() are called multiple times. If a route with a blackhole nexthop is removed in that process, the later removal requests of the route fail with -EINVAL, rathar than -ESRCH, as the corresponding nexthop does not exist anymore. So, let's not remove routes which managed by Manager more than once.
System and Service Manager
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