[tor-bugs] #7066 [Tor]: Guard disablement by path-bias detector must be disabled or removed

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#7066: Guard disablement by path-bias detector must be disabled or removed
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 Reporter:  rransom     |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  blocker     |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor         |        Version:                    
 Keywords:  tor-client  |         Parent:                    
   Points:              |   Actualpoints:                    
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 Currently, any three dirauths (or any two dirauths if one other one starts
 voting on the relevant consensus parameters) can configure Tor clients to
 stop using their entry guards after a very small number of failed circuit-
 build attempts.  This is as bad for a client as having UseEntryGuards
 disabled entirely.

 Tor 0.2.3.x users will be compromised by this without even a log message
 warning them that they are abandoning entry guards.

 This feature must be disabled completely for now or removed.  The current
 path-bias detector code is unsafe to use with ''any'' non-zero value of
 `pb_disablepct`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7066>
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