Description:

Brainstormed in my PR #9209 but then I realize the issue is there before.
#7617

The background is RdsRouteConfigSubscription has been shared by multiple providers across listeners.
Upon subscription construction the subscription keep a reference to the Init::Manager provided by the listener.
If the RDS config has VHDS field, VHDS subscription will be created and that Init::Manager reference will be dereferenced.
Since subscription is shared across listeners, the above Init::Manager might be already destructed with the initial listener.

Boom.