Re: [tor-relays] 100K circuit request per minute for hours killed my relay

[Scott Bennett <bennett@xxxxxxx>]

Vort <vvort@xxxxxxxxx> wrote:

> > Your message prompted me to check logs, and on one relay I see the following:
>
> Similar thing for me:
>
> Jul 19 00:08:27.000 [notice] Circuit handshake stats since last time: 3571/3571 TAP, 41180/41180 NTor.
> Jul 19 06:08:27.000 [notice] Circuit handshake stats since last time: 2054/2054 TAP, 29181/29181 NTor.
> Jul 19 12:08:28.000 [notice] Circuit handshake stats since last time: 2773/2773 TAP, 26497/26497 NTor.
> Jul 19 18:08:28.000 [notice] Circuit handshake stats since last time: 3970/3970 TAP, 31344/31344 NTor.
> Jul 20 00:08:28.000 [notice] Circuit handshake stats since last time: 4096/4096 TAP, 41730/41730 NTor.
> Jul 20 06:08:28.000 [notice] Circuit handshake stats since last time: 18285/18285 TAP, 54102/54102 NTor.
> Jul 20 12:08:28.000 [notice] Circuit handshake stats since last time: 61136/61386 TAP, 378196/378339 NTor.
> Jul 20 18:08:29.000 [notice] Circuit handshake stats since last time: 73297/73688 TAP, 566708/566892 NTor.
> Jul 21 00:08:29.000 [notice] Circuit handshake stats since last time: 67165/67830 TAP, 572685/572851 NTor.
> Jul 21 06:08:29.000 [notice] Circuit handshake stats since last time: 31988/32138 TAP, 521455/521536 NTor.
> Jul 21 12:08:29.000 [notice] Circuit handshake stats since last time: 5523/5523 TAP, 222378/222432 NTor.
>
> Also there are too much "[warn] assign_to_cpuworker failed. Ignoring." lines in the logs.
>
     This sort of thing has been going on for many years.  I used to refer
to it as "mobbing".  As nearly as I was ever able to determine, the behavior
is an unintended consequence of hidden services.  I found that I could greatly
reduce the frequency of occurrence, but *not* to zero, by setting 

HidServDirectoryV2 0

in my torrc file.  My tentative conclusion was that the majority of these
events are cases in which a relay has been selected as an HSDir to which
a hidden service descriptor has been posted for a very popular hidden service,
so by refusing to be a hidden service directory mirror, those cases can be
eliminated.  I never had a very satisfying hypothesis to explain the remaining
minority of cases.


                                  Scott Bennett, Comm. ASMELG, CFIAG
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