[tor-bugs] #22255 [Core Tor/Tor]: Frequent OOM kills of tor process

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jun 1 18:36:14 UTC 2017


#22255: Frequent OOM kills of tor process
--------------------------+------------------------------------
 Reporter:  DeS           |          Owner:
     Type:  defect        |         Status:  new
 Priority:  High          |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Major         |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by DeS):

 > Also note: Be aware that connection graphs at that granularity are
 considered sensitive.

 I´m open to other ideas how to exchange this information. But you will
 agree this problem needs to be looked at.

 Clearly there is a correlation between memory an connections. Please refer
 to:

 https://trac.torproject.org/projects/tor/attachment/ticket/22255/memory-
 pinpoint%3D1496233206%2C1496341206.png

 https://trac.torproject.org/projects/tor/attachment/ticket/22255/netstat-
 pinpoint%3D1496233206%2C1496341206.png

 BUT
 1) as you can see on this pictures the system "dies" once at 19 k
 connections. But two times later everything is fine at more than 20k
 connections
 2) At every time (execpt the blank obviously) there is plenty of free
 memory.
 3) Our machines operatate limited to ~320 - 400 Mbits and memory has never
 been an issue in 1-2 years
 4) How do we explain the tor process just uses 400 Meg of memory each (see
 arma comment above)

 Something is not adding up here and this is what we have to find out.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22255#comment:46>
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