[tor-bugs] #20307 [Core Tor/Tor]: [warn] Remote server sent bogus reason code 65021

[Tor Bug Tracker & Wiki]

#20307: [warn] Remote server sent bogus reason code 65021
------------------------------+--------------------------------
     Reporter:  arma          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.9.3-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 On my Tor client running 0.2.9.3-alpha-dev (git-bfaded9143d127cb) on a
 really crummy network, I got a string of 65 of these lines:
 {{{
 Oct 06 16:21:58.020 [warn] Remote server sent bogus reason code 65021
 Oct 06 16:21:59.027 [warn] Remote server sent bogus reason code 65021
 ...
 }}}

 In fact, I got one of those warns per second for 65 seconds.

 But when I look at the more detailed logs for the first one, I see
 {{{
 Oct 06 16:21:58.020 [info] circuit_build_failed(): Our circuit failed to
 get a response from the first hop (62.210.123.24:443). I'm going to try to
 rotate to a better connection.
 Oct 06 16:21:58.020 [info] entry_guard_register_connect_status(): Unable
 to connect to entry guard 'Alastor'
 (2EB3C230180694A1E848001E20F36F76A2287039). Marking as unreachable.
 Oct 06 16:21:58.020 [warn] Remote server sent bogus reason code 65021
 Oct 06 16:21:58.020 [debug] circuit_get_by_circid_channel_impl():
 circuit_get_by_circid_channel_impl() returning circuit 0x7fda41028de0 for
 circ_id 3884794536, channel ID 1 (0x7fda41c62410)
 Oct 06 16:21:58.020 [debug] circuitmux_append_destroy_cell(): Cmux at
 0x7fda41c625d0 queued a destroy for circ 3884794536, cmux counter is now
 1, global counter is now 1
 Oct 06 16:21:58.020 [debug] channel_send_destroy(): Sending destroy
 (circID 3884794536) on channel 0x7fda41c62410 (global ID 1)
 }}}

 So it would seem that no "end" cell was received at all. Maybe we are
 setting END_CIRC_REASON_FLAG_REMOTE somewhere where we shouldn't? Also,
 what is the mechanism by which the number makes it all the way up to
 65021?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20307>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online