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[tor-bugs] #17441 [DocTor]: Warn if votes disagree too much about any given flag



#17441: Warn if votes disagree too much about any given flag
-----------------------------+--------------------
     Reporter:  karsten      |      Owner:  atagar
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  DocTor       |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
-----------------------------+--------------------
 I noticed yesterday that many, many relays only receive the BadExit flag
 from a single authority which is not enough for that flag to be included
 in the consensus.  I asked arma about this, who didn't know about it and
 who fixed it right away, so that there are now two authorities voting
 BadExit on those relays.  He also asked if there's a way for DocTor to
 notify us about such things.

 Here's the data I used.  For example, `"2015-10-26
 12:00:00,BadExit,1,2,58"` means that on 2015-10-26 at 12:00:00, there were
 58 relays that received the BadExit flag from exactly 1 directory
 authority where 2 would have been required for that flag to be included in
 the consensus.  One day later, `"2015-10-27 12:00:00,BadExit,1,2,7"`, only
 7 relays remained that only received a single BadExit flag in the votes.

 {{{
 validafter,attribute,votes,required,relays
 2015-10-26 12:00:00,Authority,1,5,0
 2015-10-26 12:00:00,Authority,2,5,0
 2015-10-26 12:00:00,Authority,3,5,0
 2015-10-26 12:00:00,Authority,4,5,0
 2015-10-26 12:00:00,Authority,5,5,0
 2015-10-26 12:00:00,Authority,6,5,0
 2015-10-26 12:00:00,Authority,7,5,0
 2015-10-26 12:00:00,Authority,8,5,10
 2015-10-26 12:00:00,BadExit,1,2,58
 2015-10-26 12:00:00,BadExit,2,2,1
 2015-10-26 12:00:00,BadExit,3,2,4
 2015-10-26 12:00:00,Exit,1,5,6
 2015-10-26 12:00:00,Exit,2,5,16
 2015-10-26 12:00:00,Exit,3,5,13
 2015-10-26 12:00:00,Exit,4,5,26
 2015-10-26 12:00:00,Exit,5,5,19
 2015-10-26 12:00:00,Exit,6,5,33
 2015-10-26 12:00:00,Exit,7,5,178
 2015-10-26 12:00:00,Exit,8,5,761
 2015-10-26 12:00:00,Fast,1,5,305
 2015-10-26 12:00:00,Fast,2,5,54
 2015-10-26 12:00:00,Fast,3,5,823
 2015-10-26 12:00:00,Fast,4,5,84
 2015-10-26 12:00:00,Fast,5,5,110
 2015-10-26 12:00:00,Fast,6,5,241
 2015-10-26 12:00:00,Fast,7,5,459
 2015-10-26 12:00:00,Fast,8,5,4072
 2015-10-26 12:00:00,Guard,1,5,211
 2015-10-26 12:00:00,Guard,2,5,98
 2015-10-26 12:00:00,Guard,3,5,87
 2015-10-26 12:00:00,Guard,4,5,94
 2015-10-26 12:00:00,Guard,5,5,129
 2015-10-26 12:00:00,Guard,6,5,175
 2015-10-26 12:00:00,Guard,7,5,646
 2015-10-26 12:00:00,Guard,8,5,865
 2015-10-26 12:00:00,HSDir,1,5,117
 2015-10-26 12:00:00,HSDir,2,5,59
 2015-10-26 12:00:00,HSDir,3,5,33
 2015-10-26 12:00:00,HSDir,4,5,25
 2015-10-26 12:00:00,HSDir,5,5,38
 2015-10-26 12:00:00,HSDir,6,5,349
 2015-10-26 12:00:00,HSDir,7,5,1455
 2015-10-26 12:00:00,HSDir,8,5,1136
 2015-10-26 12:00:00,Measured,1,3,57
 2015-10-26 12:00:00,Measured,2,3,102
 2015-10-26 12:00:00,Measured,3,3,198
 2015-10-26 12:00:00,Measured,4,3,491
 2015-10-26 12:00:00,Measured,5,3,6361
 2015-10-26 12:00:00,Running,1,5,13
 2015-10-26 12:00:00,Running,2,5,37
 2015-10-26 12:00:00,Running,3,5,11
 2015-10-26 12:00:00,Running,4,5,77
 2015-10-26 12:00:00,Running,5,5,13
 2015-10-26 12:00:00,Running,6,5,59
 2015-10-26 12:00:00,Running,7,5,85
 2015-10-26 12:00:00,Running,8,5,6455
 2015-10-26 12:00:00,Stable,1,5,383
 2015-10-26 12:00:00,Stable,2,5,49
 2015-10-26 12:00:00,Stable,3,5,36
 2015-10-26 12:00:00,Stable,4,5,48
 2015-10-26 12:00:00,Stable,5,5,58
 2015-10-26 12:00:00,Stable,6,5,122
 2015-10-26 12:00:00,Stable,7,5,2353
 2015-10-26 12:00:00,Stable,8,5,2879
 2015-10-26 12:00:00,V2Dir,1,5,1
 2015-10-26 12:00:00,V2Dir,2,5,27
 2015-10-26 12:00:00,V2Dir,3,5,0
 2015-10-26 12:00:00,V2Dir,4,5,42
 2015-10-26 12:00:00,V2Dir,5,5,0
 2015-10-26 12:00:00,V2Dir,6,5,5
 2015-10-26 12:00:00,V2Dir,7,5,25
 2015-10-26 12:00:00,V2Dir,8,5,4567
 2015-10-26 12:00:00,Valid,1,5,5
 2015-10-26 12:00:00,Valid,2,5,31
 2015-10-26 12:00:00,Valid,3,5,1
 2015-10-26 12:00:00,Valid,4,5,71
 2015-10-26 12:00:00,Valid,5,5,3
 2015-10-26 12:00:00,Valid,6,5,5
 2015-10-26 12:00:00,Valid,7,5,37
 2015-10-26 12:00:00,Valid,8,5,7282
 2015-10-27 12:00:00,Authority,1,5,0
 2015-10-27 12:00:00,Authority,2,5,0
 2015-10-27 12:00:00,Authority,3,5,0
 2015-10-27 12:00:00,Authority,4,5,0
 2015-10-27 12:00:00,Authority,5,5,0
 2015-10-27 12:00:00,Authority,6,5,0
 2015-10-27 12:00:00,Authority,7,5,1
 2015-10-27 12:00:00,Authority,8,5,9
 2015-10-27 12:00:00,BadExit,1,2,7
 2015-10-27 12:00:00,BadExit,2,2,51
 2015-10-27 12:00:00,BadExit,3,2,4
 2015-10-27 12:00:00,Exit,1,5,6
 2015-10-27 12:00:00,Exit,2,5,15
 2015-10-27 12:00:00,Exit,3,5,18
 2015-10-27 12:00:00,Exit,4,5,27
 2015-10-27 12:00:00,Exit,5,5,21
 2015-10-27 12:00:00,Exit,6,5,38
 2015-10-27 12:00:00,Exit,7,5,173
 2015-10-27 12:00:00,Exit,8,5,761
 2015-10-27 12:00:00,Fast,1,5,285
 2015-10-27 12:00:00,Fast,2,5,55
 2015-10-27 12:00:00,Fast,3,5,852
 2015-10-27 12:00:00,Fast,4,5,77
 2015-10-27 12:00:00,Fast,5,5,111
 2015-10-27 12:00:00,Fast,6,5,221
 2015-10-27 12:00:00,Fast,7,5,489
 2015-10-27 12:00:00,Fast,8,5,4060
 2015-10-27 12:00:00,Guard,1,5,212
 2015-10-27 12:00:00,Guard,2,5,105
 2015-10-27 12:00:00,Guard,3,5,88
 2015-10-27 12:00:00,Guard,4,5,92
 2015-10-27 12:00:00,Guard,5,5,125
 2015-10-27 12:00:00,Guard,6,5,175
 2015-10-27 12:00:00,Guard,7,5,661
 2015-10-27 12:00:00,Guard,8,5,850
 2015-10-27 12:00:00,HSDir,1,5,100
 2015-10-27 12:00:00,HSDir,2,5,85
 2015-10-27 12:00:00,HSDir,3,5,18
 2015-10-27 12:00:00,HSDir,4,5,29
 2015-10-27 12:00:00,HSDir,5,5,26
 2015-10-27 12:00:00,HSDir,6,5,188
 2015-10-27 12:00:00,HSDir,7,5,829
 2015-10-27 12:00:00,HSDir,8,5,1934
 2015-10-27 12:00:00,Measured,1,3,81
 2015-10-27 12:00:00,Measured,2,3,111
 2015-10-27 12:00:00,Measured,3,3,189
 2015-10-27 12:00:00,Measured,4,3,492
 2015-10-27 12:00:00,Measured,5,3,6361
 2015-10-27 12:00:00,Running,1,5,14
 2015-10-27 12:00:00,Running,2,5,48
 2015-10-27 12:00:00,Running,3,5,6
 2015-10-27 12:00:00,Running,4,5,65
 2015-10-27 12:00:00,Running,5,5,13
 2015-10-27 12:00:00,Running,6,5,65
 2015-10-27 12:00:00,Running,7,5,97
 2015-10-27 12:00:00,Running,8,5,6473
 2015-10-27 12:00:00,Stable,1,5,371
 2015-10-27 12:00:00,Stable,2,5,41
 2015-10-27 12:00:00,Stable,3,5,34
 2015-10-27 12:00:00,Stable,4,5,45
 2015-10-27 12:00:00,Stable,5,5,52
 2015-10-27 12:00:00,Stable,6,5,129
 2015-10-27 12:00:00,Stable,7,5,2332
 2015-10-27 12:00:00,Stable,8,5,2897
 2015-10-27 12:00:00,V2Dir,1,5,0
 2015-10-27 12:00:00,V2Dir,2,5,26
 2015-10-27 12:00:00,V2Dir,3,5,1
 2015-10-27 12:00:00,V2Dir,4,5,47
 2015-10-27 12:00:00,V2Dir,5,5,0
 2015-10-27 12:00:00,V2Dir,6,5,11
 2015-10-27 12:00:00,V2Dir,7,5,41
 2015-10-27 12:00:00,V2Dir,8,5,4596
 2015-10-27 12:00:00,Valid,1,5,1
 2015-10-27 12:00:00,Valid,2,5,37
 2015-10-27 12:00:00,Valid,3,5,2
 2015-10-27 12:00:00,Valid,4,5,74
 2015-10-27 12:00:00,Valid,5,5,4
 2015-10-27 12:00:00,Valid,6,5,11
 2015-10-27 12:00:00,Valid,7,5,50
 2015-10-27 12:00:00,Valid,8,5,7306
 }}}

 I'm not sure what would be good thresholds for DocTor to send out
 warnings.  Maybe: if more than x% of relays receiving a flag in any of the
 votes don't receive enough votes for that flag to be included in the
 consensus, with x = 20?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17441>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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