[tor-bugs] #17359 [Tor]: __DisablePredictedCircuits causes bootstrap to hang at "Connecting to Tor Network"

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#17359: __DisablePredictedCircuits causes bootstrap to hang at "Connecting to Tor
Network"
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     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:
     Severity:  Minor   |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
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 When __DisablePredictedCircuits is set in the torrc, bootstrap hangs at
 80% - "Connecting to Tor Network".

 This happens in hidden service configurations, it may happen in other
 client or server configurations as well.

 I think this is because:
 * no predicted circuits are being built, and therefore
 * tor never completes an OR connection, and therefore
 * tor never thinks it has bootstrapped, and therefore
 * tor doesn't make any of the OR connections it would make as part of its
 configured function

 To fix this, we need to either:
 * assume tor is connected to the network if it gets to "Connecting to Tor
 Network" and __DisablePredictedCircuits is set, or
 * make at least one connection at "Connecting to Tor Network" even if
 __DisablePredictedCircuits is set

 The first risks repeatedly making connections if tor isn't connected to
 the network, the second risks making connections the user doesn't want.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17359>
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