[tor-bugs] #13603 [Core Tor/Tor]: Many channels closing with "IOERROR" reason given on control port.

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#13603: Many channels closing with "IOERROR" reason given on control port.
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 Reporter:  toralf                               |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.5.10
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay needs-analysis networking  |  Actual Points:
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by toralf):

 I'd like to come back to this topic mainly due to the DoS against Tor
 relays in the last few days.

 I used [1] to gather the state of closed connections and [2] to count DONE
 IOERROR TIMEOUT CONNECTRESET counts create a histogram of those values.
 The measurement was made in the last 3 days.

 Whilst majority of relays have just few IOERRORS, there're a bunch if
 relays having hundreds or thousands of failures within 2 days w/o any
 DONE. FWIW the authority faravahar has almost CONNECTRESET.

 I'll attach the fingerprints and the histogram got from my 2 relays
 (running at the hardware)

 [1] https://github.com/toralf/torutils/blob/master/orstatus.py
 [2] https://github.com/toralf/torutils/blob/master/plot.sh

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13603#comment:26>
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