[tor-bugs] #19989 [Core Tor/Tor]: Tor fails to bootstrap with an Exit as EntryNode (was: Tor fails to bootstrap with a single EntryNode)

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#19989: Tor fails to bootstrap with an Exit as EntryNode
--------------------------+------------------------------
 Reporter:  teor          |          Owner:
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.2.???
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  fallback      |  Actual Points:
Parent ID:                |         Points:  1
 Reviewer:                |        Sponsor:
--------------------------+------------------------------
Changes (by teor):

 * keywords:  guard => fallback


Old description:

> When I try to run tor with EntryNodes x (where x is a single relay), it
> hangs at:
>
> {{{
> Aug 26 00:51:57.000 [notice] Bootstrapped 45%: Asking for relay
> descriptors
> Aug 26 00:51:57.000 [notice] I learned some more directory information,
> but not enough to build a circuit: We need more microdescriptors: we have
> 0/6973, and can only build 0% of likely paths. (We have 0% of guards bw,
> 0% of midpoint bw, and 0% of exit bw = 0% of path bw.)
> Aug 26 00:51:58.000 [notice] Bootstrapped 50%: Loading relay descriptors
> }}}
>
> This issue might prevent us from switching to one guard in future
> releases.
>
> I can reproduce this issue on 0.2.9.2-alpha-dev, 0.2.8.{6,7},
> maint-0.2.7, maint-0.2.6 using the following command:
> {{{
> src/or/tor DataDirectory /tmp/tor.$$ SOCKSPort 0 EntryNodes x
> }}}

New description:

 When I try to run tor with EntryNodes x (where x is a single Exit relay),
 it hangs at:

 {{{
 Aug 26 00:51:57.000 [notice] Bootstrapped 45%: Asking for relay
 descriptors
 Aug 26 00:51:57.000 [notice] I learned some more directory information,
 but not enough to build a circuit: We need more microdescriptors: we have
 0/6973, and can only build 0% of likely paths. (We have 0% of guards bw,
 0% of midpoint bw, and 0% of exit bw = 0% of path bw.)
 Aug 26 00:51:58.000 [notice] Bootstrapped 50%: Loading relay descriptors
 }}}

 ~~This issue might prevent us from switching to one guard in future
 releases.~~
 This issue likely makes Exits useless as fallback directories for
 IPv6-only microdescriptor clients (#19608).

 I can reproduce this issue on 0.2.9.2-alpha-dev, 0.2.8.{6,7}, maint-0.2.7,
 maint-0.2.6 using the following command:
 {{{
 src/or/tor DataDirectory /tmp/tor.$$ SOCKSPort 0 EntryNodes x
 }}}

--

Comment:

 I chose an exit. It fails for me with any exit.
 I've updated the description and the title.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19989#comment:2>
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