[tor-bugs] #25461 [Core Tor/Tor]: main event-loop spins consuming 100% of a CPU core running scheduler_set_channel_state

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#25461: main event-loop spins consuming 100% of a CPU core running
scheduler_set_channel_state
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 Reporter:  Dhalgren                             |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.9.14
 Severity:  Normal                               |     Resolution:
 Keywords:  performance, 034-roadmap-subtask,    |  Actual Points:
  034-triage-20180328, 034-included-20180328     |
  035-removed                                    |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by Dhalgren):

 For several days now 100% CPU on main event-loop thread.  Tor 0.3.5.8
 libevent 2.0.22-stable.  Any reason why updating to 2.1.8-stable would
 make a difference?  Have 40 second full debug capture but will not waste
 time in analyzing if newer libevent matters.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25461#comment:20>
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