Seems like there are still a few cases where bootstrapping will stall because of: ``` I learned some more directory information, but not enough to build a circuit: We're missing descriptors for some of our primary entry guards ``` It seems to happen mainly with bridges. For me it occured with latest master (`b081a7ed2`) when I was switching between using private bridges and the default TBB bridges. I also heard reports from s7r about this happening. We last changed this behavior in legacy/trac#21415, when we made Tor require that we have the descriptor of 2 bridges before we start building circuits.