[tor-bugs] #20511 [Core Tor/Tor]: add a failsafe where if you're about to serve a consensus that you know is obsolete, don't do it

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#20511: add a failsafe where if you're about to serve a consensus that you know is
obsolete, don't do it
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 Reporter:  arma          |          Owner:
     Type:  enhancement   |         Status:  new
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by rubiate):

 > Is there a consensus age past which the correct answer for a dir cache
 in that situation should be "I'm really sorry, but it's for your own good:
 404"?

 24 hours is how long past the valid-until time it can be before "We have
 no recent usable consensus" happens (per
 update_router_have_minimum_dir_info() and
 networkstatus_get_reasonably_live_consensus()).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20511#comment:1>
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