[tor-bugs] #28639 [Core Tor/sbws]: After several days, most of the circuits timeout

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#28639: After several days, most of the circuits timeout
------------------------------------------+--------------------------------
 Reporter:  juga                          |          Owner:  (none)
     Type:  defect                        |         Status:
                                          |  needs_information
 Priority:  Medium                        |      Milestone:  sbws:
                                          |  1.0.x-final
Component:  Core Tor/sbws                 |        Version:
 Severity:  Normal                        |     Resolution:
 Keywords:  sbws-1.0-must-moved-20181128  |  Actual Points:
Parent ID:  #25925                        |         Points:
 Reviewer:                                |        Sponsor:
------------------------------------------+--------------------------------

Comment (by teor):

 Replying to [comment:14 juga]:
 > Replying to [comment:11 teor]:
 > > Can you please paste the full info-level logs in a pastebin?
 > > It looks like these warning logs come after any errors that are
 disabling the relays.
 >
 > Complete info log, 5 first minutes from a test instance, running from
 master (so it has torrc debugging options) where i also added to torrc
 info log and ConnectionPadding 0. It has 'LearnCircuitBuildTimeout': 0.
 Tor version 0.3.4.9:
 >
 > https://paste.debian.net/hidden/db05571a/

 I'm sorry, I need the logs when sbws is stalled.

 > Are these 3 length circuits?: `exit circ (length 3, last hop
 CalyxInstitute05)`.

 Yes.

 > Any suggestion on what to search for in the log?

 If sbws is stalling because all 3-hop circuits time out:

 Replying to [comment:12 teor]:
 > This issue is an instance of #27049: sbws does not open any 3-hop
 circuits, so it stalls when all 3-hop circuits time out.
 >
 > One quick fix is to enable predicted circuits (#28701).
 >
 > I opened a tor ticket for this issue (#28714).

 Then you should look for:
 * circuit timeout messages
 * "No circuits are opened"
 * messages that say that Tor has no live guards

 Since you changed the tor version, I don't know if the messages will be
 the same as 0.2.9.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28639#comment:15>
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