Re: [tor-bugs] #9972 [Tor]: Failed to find node for hop 0 of our path. Discarding this circuit.

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#9972: Failed to find node for hop 0 of our path. Discarding this circuit.
------------------------+------------------------------------
     Reporter:  mr-4    |      Owner:  nickm
         Type:  defect  |     Status:  assigned
     Priority:  normal  |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor     |    Version:  Tor: 0.2.4.17-rc
   Resolution:          |   Keywords:  tor-client 025-triaged
Actual Points:          |  Parent ID:
       Points:          |
------------------------+------------------------------------

Comment (by asn):

 Hm, I still don't see what causes this bug. Especially in the case of a
 bridge with no restrictions on its EntryNodes. I will look into this more.

 Some notes on branch `bug9972`:

 This looks like a forgotten format string:
 {{{
 -  log_notice(LD_GENERAL, "%d entries in guards",
 smartlist_len(entry_guards));
 +  log_notice(LD_GENERAL, "%d entries in guards after adding enough
 EntryNodes");
 }}}

 I'm also a bit confused by these changes:
 {{{
 -  if (!entry_list_is_constrained(options) &&
 +  if (! options->UseBridges &&
 }}}
 It seems to me that those checks were there, so that if the user has
 configured `EntryGuards` we make sure that they are strictly enforced.
 With the new checks, it seems that even if the user has configured
 `EntryGuards`, if they are less than `num_needed` we will go ahead and add
 random entry guards from the consensus. Is this what we want, or am I
 misreading the code? I'd say that if a user's configured `EntryGuards` are
 not sufficient to bootstrap Tor, Tor should fail closed and abort and ask
 the user to tune their `EntryGuards`.

 Turning this to `needs_revision` for the format string, and I plan to
 review more soon.

 I'd like to try to reproduce this. I'm still puzzled by the case of the
 single bridge with no entry guard restrictions.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9972#comment:20>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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