[tor-bugs] #20511 [Core Tor/Tor]: add a failsafe where if you're about to serve a consensus that you know is obsolete, don't do it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#20511: add a failsafe where if you're about to serve a consensus that you know is
obsolete, don't do it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:  needs_review
 Priority:  Medium                         |      Milestone:  Tor:
                                           |  0.3.0.x-final
Component:  Core Tor/Tor                   |        Version:  Tor:
                                           |  0.2.9.1-alpha
 Severity:  Normal                         |     Resolution:
 Keywords:  029-proposed, review-group-13  |  Actual Points:
Parent ID:                                 |         Points:
 Reviewer:                                 |        Sponsor:
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Comment (by arma):

 Code looks good! I haven't looked at the unit test part. I recommend
 putting it in an 0.3.0 for a while before we consider a backport to 0.2.9.
 (And I hope that we'll choose to not backport it, since clients use 3
 dirguards and we've survived this long with this bug in Tor.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20511#comment:15>
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