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Re: [tor-bugs] #16585 [Tor]: relay stops forwarding all traffic when client function cannot establish circuits -- scheduler_run() starvation (was: relay stops forwarding all traffic when client function cannot establish circuits)
#16585: relay stops forwarding all traffic when client function cannot establish
circuits -- scheduler_run() starvation
---------------------------+---------------------------
Reporter: starlight | Owner:
Type: defect | Status: new
Priority: major | Milestone:
Component: Tor | Version: Tor: 0.2.6.10
Resolution: | Keywords:
Actual Points: | Parent ID:
Points: |
---------------------------+---------------------------
Changes (by starlight):
* priority: normal => major
Comment:
Nailed it down.
Problem starts at
{{{
Aug 14 22:11:15.000 [debug] new_route_len(): Chosen route length 3
(6239/7105 routers suitable).
.
.
.
Aug 14 22:11:16.000 [debug] circuit_increment_failure_count():
n_circuit_failures now 1.
}}}
at which time
{{{
scheduler_run(): We have a chance to run the scheduler
}}}
goes into starvation, and `scheduler_run()` is not
invoked again for 2000 milliseconds
here's a histogram where the left column is total
logged events and the right column is `scheduler_run()`
{{{
22:11:12 67873 363
22:11:13 78595 658
22:11:14 93149 242
22:11:15 14383 5
22:11:16 1812 0
22:11:17 1200 0
22:11:18 5547 0
22:11:19 18219 4
22:11:20 3729 0
22:11:21 5063 0
22:11:22 1445 0
22:11:23 6735 0
22:11:24 28 0
22:11:25 63976 17
22:11:26 67298 28
22:11:27 77377 38
22:11:28 100585 80
22:11:29 99899 71
22:11:30 77994 72
22:11:31 101059 99
22:11:32 100829 94
22:11:33 79472 84
22:11:34 99978 98
22:11:35 98906 89
22:11:36 81795 77
22:11:37 100629 170
22:11:38 98391 213
22:11:39 79961 223
22:11:40 81213 659
22:11:41 93819 566
22:11:42 82917 744
22:11:43 85495 538
22:11:44 29038 271
22:11:45 71416 259
22:11:46 58348 656
22:11:47 65918 686
22:11:48 78183 568
22:11:49 70243 651
22:11:50 86030 608
22:11:51 67953 744
22:11:52 74292 662
22:11:53 91937 562
}}}
so it's fairly obvious `scheduler_run()`
starvation and whatever is causing it is
the problem
FULL [DEBUG] LEVEL LOG IS ATTACHED TO TICKET IN TWO .XZ PARTS
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16585#comment:5>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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