[tbb-bugs] #16990 [Tor Browser]: Circuit visualizer stops working after some time

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#16990: Circuit visualizer stops working after some time
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 Reporter:  cypherpunks                          |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  Medium                               |         Status:
Component:  Tor Browser                          |  assigned
 Severity:  Normal                               |      Milestone:
 Keywords:  tbb-torbutton tbb-circuit-display    |        Version:
  TorBrowserTeam201601                           |     Resolution:
Parent ID:                                       |  Actual Points:
  Sponsor:                                       |         Points:
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Comment (by cypherpunks):

 Replying to [comment:21 cypherpunks]:
 > But I'll remember to grab the log next time it happens.

 So it happened again. I have a log (*) of visiting blog.tp.o while the
 display is borked but it doesn't look too useful to me, relevant messages
 (if there were any) occurred earlier.

 However something is interesting: The display seems to have shut itself
 down. Notice that there are no control port messages in the log. ISTM as
 if TorButton entered one of the codepaths that lead to {{{stop()}}} in
 {{{setupDisplay()}}} and never {{{start()}}}ed again.

 (*) I actually set loglevel to 0, so as to try and grab everything.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16990#comment:26>
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