[tor-bugs] #1926 [Metrics]: Extra-info descriptors have corrupt {write, read}-history lines

[Tor Bug Tracker & Wiki]

#1926: Extra-info descriptors have corrupt {write,read}-history lines
---------------------+------------------------------------------------------
 Reporter:  karsten  |       Owner:  karsten
     Type:  defect   |      Status:  new    
 Priority:  normal   |   Milestone:         
Component:  Metrics  |     Version:         
 Keywords:           |      Parent:         
---------------------+------------------------------------------------------
 While parsing extra-info descriptors for the dir bytes analysis, I found
 that some of them have weird write-history or read-history lines with
 obviously wrong dates. I wonder what leads to these false reports and if
 there are more errors like this in extra-info descriptors.

 Here are some examples:

 {{{
 published 2010-09-03 08:21:00
 write-history 2002-01-01 00:47:32 (900 s) 0,109568,44032,189440,219136,
 92160,190464,354304,126976
 read-history 2002-01-01 00:47:32 (900 s) 816128,1042432,163840,180224,
 2770944,221184,133120,359424,770048
 }}}

 {{{
 published 2010-06-08 19:20:14
 write-history 2003-01-01 02:20:36 (900 s) 8192,26624,18432,49152,169984
 read-history 2003-01-01 02:20:36 (900 s) 147456,154624,13312,23552,2411520
 }}}

 {{{
 published 2010-08-17 17:14:51
 write-history 2003-01-01 03:16:39 (900 s) 3454976
 read-history 2010-08-17 04:16:39 (900 s)
 }}}

 {{{
 published 2010-08-31 12:12:21
 write-history 2002-01-01 03:06:31 (900 s) 117760,69632,59392,52224,61440,
 871424,3474432,3022848,4219904,2000896,160768,138240,138240,175104,131072,
 47104,59392,33792,37888,87040
 read-history 2002-01-01 03:06:31 (900 s) 1923072,52224,194560,35840,
 1046528,906240,3657728,3198976,5303296,2452480,338944,423936,1155072,
 308224,119808,193536,1045504,91136,191488,104448
 }}}

 {{{
 published 2010-08-31 12:12:28
 write-history 2002-01-01 03:06:31 (900 s) 117760,69632,59392,52224,61440,
 871424,3474432,3022848,4219904,2000896,160768,138240,138240,175104,131072,
 47104,59392,33792,37888,87040
 read-history 2010-08-31 12:06:31 (900 s) 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0
 }}}

 {{{
 published 2010-05-28 21:30:25
 write-history 2010-05-28 21:15:26 (900 s) 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0
 read-history 1970-01-02 07:45:26 (900 s) 1245184,447488,1458176,1916928,
 324608,479232,133120,272384,1698816,791552,573440,381952,352256,667648,
 451584,861184,515072,902144,301056,5548032,14390272,11052032,395264,
 372736,250880,560128,202752,199680,1078272,915456,2571264,227328,194560,
 602112,189440,325632,194560,450560,320512,180224,263168,488448,167936,
 172032,135168,506880,175104,205824,23552,401408,21504,21504,180224,274432,
 18432,139264,15360,399360,13312,143360,20480,405504,16384,143360,16384,
 398336,11264,142336,15360,270336,15360,143360,15360,398336,15360,14336,
 20480,407552,18432,147456,13312,414720,13312,144384,10240,406528,3072,
 135168,8192,270336,4096,7168,5120,404480,7168,5120
 }}}


 Any idea what causes this problem? I didn't find an obvious pattern in
 these examples. Is it just memory corruption on the relays?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1926>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online