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Re: [tor-bugs] #15493 [Tor Browser]: Redirects sometimes seem to break circuit status UI

#15493: Redirects sometimes seem to break circuit status UI
-----------------------------+------------------------------------------
     Reporter:  mikeperry    |      Owner:  gk
         Type:  defect       |     Status:  assigned
     Priority:  normal       |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:  tbb-circuit-display, tbb-5.0
Actual Points:               |  Parent ID:
       Points:               |
-----------------------------+------------------------------------------

Comment (by gk):

 The problem for the majority of the failures I've seen is that watching
 for the STREAM event is racing with updating the circuit display resulting
 sometimes in logs like the following:
 {{{
 [06-12 08:09:29] Torbutton INFO: updating circuit display
 }}}
 This is right at the beginning of `updateCircuitDisplay()`
 {{{
 [06-12 08:09:29] Torbutton INFO: got credentials zeit.de:2
 }}}
 This got logged right at the beginning of the `if (credentials)` block in
 the same function; but we don't have something for `nodeData` yet as
 `credentialsToNodeDataMap` is not ready yet, hence
 {{{
 [06-12 08:09:29] Torbutton INFO: about to show the display with: undefined
 }}}
 which is logged by
 {{{
     logger.eclog(3, "about to show the display with: " + (credentials &&
 nodeData));
 }}}
 immediately before `showCircuitDisplay()` is called.
 [06-12 08:09:29] Torbutton INFO: showing the circuit display, show is:
 undefined
 Finally, `credentialsToNodeDataMap` gets updated:
 {{{
 [06-12 08:09:29] Torbutton INFO: udpating nodeDataForCircuit
 }}}
 This got logged in the `if (credentials)` block after STREAM SENTCONNECT
 arrived.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15493#comment:8>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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