[tor-bugs] #1776 [Tor]: Allow regular relays (if they have a dirport open) to be used as bridges

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#1776: Allow regular relays (if they have a dirport open) to be used as bridges
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     Reporter:           |      Owner:  asn
  Sebastian              |     Status:  closed
         Type:  defect   |  Milestone:  Tor: 0.2.6.x-final
     Priority:  major    |    Version:
    Component:  Tor      |   Keywords:  regression crash tor-bridge
   Resolution:  fixed    |  026-triaged-1
Actual Points:           |  Parent ID:
       Points:           |
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Changes (by isis):

 * cc: isis (added)


Comment:

 I have suspected that #11301 is due to normal relays getting used as
 "bridges", and they appear to jump from the `bridge_list` in entryguards.c
 to the normal routerlist, possibly when `entry_guards_compute_status()` is
 called, when it's discovered that the chosen "bridges" don't have
 `ROUTER_PURPOSE_BRIDGE`. After that, there is a weird catch-22 state where
 no DirectoryGuards exist
 to fetch the other "bridge" descriptors, or something else that I'm not
 sure about yet.

 Arma also pointed out that #14216 could also be related to this behaviour
 of sorting tables of routers, with different tables for each purpose, and
 not allowing one router to exist in multiple tables simultaneously. Either
 way, there are definitely still some bugs when using normal relays as
 bridges.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1776#comment:85>
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