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Re: [tor-bugs] #20423 [Core Tor/Tor]: Warning notice log: assign_to_cpuworker failed. Ignoring.

#20423: Warning notice log: assign_to_cpuworker failed. Ignoring.
--------------------------------+------------------------------------
 Reporter:  Felixix             |          Owner:
     Type:  defect              |         Status:  new
 Priority:  High                |      Milestone:  Tor: 0.2.9.x-final
Component:  Core Tor/Tor        |        Version:  Tor: 0.2.8.9
 Severity:  Normal              |     Resolution:
 Keywords:  regression freebsd  |  Actual Points:
Parent ID:                      |         Points:
 Reviewer:                      |        Sponsor:
--------------------------------+------------------------------------

Comment (by nickm):

 I think that the root problem here is whatever causes Tor to stall and
 overload, eating a bunch of CPU.  That would cause all of:
     * The "clock jumped X seconds forward" warning
     * The remote side to close the circuit and its channel already because
 we took too long...
     * ...leading to the duplicate close warning when we try to close it
 for being too old...
     * ...and/or leading to assign_to_cpuworker() failing because the
 channel isn't there any more.

 I'm not sure whether this stalling problem is new in 028 or not, though:
 it could be that it was present previously, but that we weren't seeing it,
 because of the changes that 028 made to how we close circuits in #17218.

 Did you see "Your system clock just jumped X seconds forward" warnings
 with older versions of Tor?  If not, we should try to figure out why those
 started.

 Additionally, we should clean up the warnings for assign_to_cpuworker()
 failing (that shouldn't be a warning), and the duplicate close warning.
 (There should be a check for whether the circuit is marked in the loop at
 the end of onion_pending_add().)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20423#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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