[tor-bugs] #21242 [Core Tor/Tor]: Start-up error [onion_extend_cpath: Assertion info || client failed; aborting]

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#21242: Start-up error [onion_extend_cpath: Assertion info || client failed;
aborting]
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 Reporter:  Felixix       |          Owner:  nickm
     Type:  defect        |         Status:  closed
 Priority:  Medium        |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:  Tor: 0.3.0.1-alpha
 Severity:  Normal        |     Resolution:  fixed
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by teor):

 Replying to [comment:10 nickm]:
 > Okay, I *think* the right fix is something like what's in my `bug21242`
 branch.  Things get a little tricky here, since it's okay to select a
 guard with no descriptor when we're using it as a directory guard.

 Actually, the rule is even more complex: it's okay to select a guard with
 no descriptor when we're using it as a directory guard, unless we're
 IPv6-only and using microdescriptors, in which case, we need the entry
 guards' microdescriptors from fallback directory mirrors in order to know
 their IPv6 addresses.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21242#comment:18>
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