PlayerEndpoint leaks 2 sockets on kurento media server

[Indystef]

KMS Version:
0:00:00.012170697 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:173:loadModules: Found module: /usr/lib/x86_64-linux-gnu/kurento/modules/libkmselementsmodule.so
0:00:00.016009462 41 0x1ec9f00 DEBUG KurentoModuleManager ModuleManager.cpp:89:loadModule: Module loaded from /usr/lib/x86_64-linux-gnu/kurento/modules/libkmselementsmodule.so
0:00:00.016061609 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:135:loadModule: Loaded elements version 6.6.3 generated at Aug 11 2017 20:18:10
0:00:00.016127404 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:173:loadModules: Found module: /usr/lib/x86_64-linux-gnu/kurento/modules/libkmscoremodule.so
0:00:00.016559369 41 0x1ec9f00 DEBUG KurentoModuleManager ModuleManager.cpp:89:loadModule: Module loaded from /usr/lib/x86_64-linux-gnu/kurento/modules/libkmscoremodule.so
0:00:00.016593861 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:135:loadModule: Loaded core version 6.6.3 generated at Aug 11 2017 19:36:36
0:00:00.016624217 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:173:loadModules: Found module: /usr/lib/x86_64-linux-gnu/kurento/modules/libkmsfiltersmodule.so
0:00:00.017326839 41 0x1ec9f00 DEBUG KurentoModuleManager ModuleManager.cpp:89:loadModule: Module loaded from /usr/lib/x86_64-linux-gnu/kurento/modules/libkmsfiltersmodule.so
0:00:00.017360966 41 0x1ec9f00 INFO KurentoModuleManager ModuleManager.cpp:135:loadModule: Loaded filters version 6.6.2 generated at Jul 25 2017 13:36:15
Version: 6.6.2
Found modules:
Module: 'core' version '6.6.3'
Module: 'elements' version '6.6.3'
Module: 'filters' version '6.6.2'

Other libraries versions:
root@ed2206e9f637:/# dpkg -l | egrep -i "kurento|gst.*1.5|nice"
ii gstreamer1.5-libav:amd64 1.8.2.120160909143244.96.g493eee4.trusty amd64 libav plugin for GStreamer
ii gstreamer1.5-nice:amd64 0.1.13.120160930090742.81.geebfdab.trusty amd64 ICE library (GStreamer plugin)
ii gstreamer1.5-plugins-bad:amd64 1.8.1.120160909144557.99.gf836e53.trusty amd64 GStreamer plugins from the "bad" set
ii gstreamer1.5-plugins-base:amd64 1.8.1.120160909142623.55.g7b19cfd.trusty amd64 GStreamer plugins from the "base" set
ii gstreamer1.5-plugins-good:amd64 1.8.1.120160909143047.112.g9ee4248.trusty amd64 GStreamer plugins from the "good" set
ii gstreamer1.5-plugins-ugly:amd64 1.8.1.120160909192513.89.g2685b0f.trusty amd64 GStreamer plugins from the "ugly" set
ii gstreamer1.5-pulseaudio:amd64 1.8.1.120160909143047.112.g9ee4248.trusty amd64 GStreamer plugin for PulseAudio
ii gstreamer1.5-x:amd64 1.8.1.120160909142623.55.g7b19cfd.trusty amd64 GStreamer plugins for X11 and Pango
ii kms-core-6.0 6.6.3.trusty.20170811193010.2704d13 amd64 Kurento core module
ii kms-elements-6.0 6.6.3.trusty.20170811201004.9e3fff4 amd64 Kurento elements module
ii kms-filters-6.0 6.6.2.trusty.20170725133434.7b4c9ea amd64 Kurento filters module
ii kms-jsonrpc-1.0 1.1.3.trusty.20170725112926.ee575c6 amd64 Kurento jsonrpc library
ii kmsjsoncpp 1.6.3.trusty.20170725122830.d78deb7 amd64 Kurento jsoncpp library
ii kurento-media-server-6.0 6.6.2.trusty.20170725135150.8e7ceee amd64 Kurento Media Server
ii libgstreamer-plugins-bad1.5-0:amd64 1.8.1.120160909144557.99.gf836e53.trusty amd64 GStreamer development files for libraries from the "bad" set
ii libgstreamer-plugins-base1.5-0:amd64 1.8.1.120160909142623.55.g7b19cfd.trusty amd64 GStreamer libraries from the "base" set
ii libgstreamer1.5-0:amd64 1.8.1.120160909144007.170.g0d6031b.trusty amd64 Core GStreamer libraries and elements
ii libnice10:amd64 0.1.13.120160930090742.81.geebfdab.trusty amd64 ICE library (shared library)

Client libraries

• Language: Java
• Version: 6.6.3

Browsers tested

• Chrome: 61.0.3163.100
• Firefox: 56.0

System description:
Dev. platform is macOS Sierra.
kurento server runs in docker,

What steps will reproduce the problem?

1. start kurento media server, for example in a docker container
2. start the tutorial "Java - Recording" in kurento-tutorial-java/kurento-hello-world-recording
3. observe the number of file descriptors: 'ls -l /proc/{PID of kurento media server}/fd | wc -l'. Also verify with 'ls -l /proc/{PID of kurento media server}/fd' that the FDs are mostly sockets
4. do a recording. When finished observe the # of oped file descriptors. 3 & 4 can be repeated, but the number of FDs stays stable after each iteration
5. do a playback. After the playback observe the FDs again. The number has increased by 2. Each time step 5 is repeated, the open FDs increase by 2 again

What is the expected result?
The expected result is that after a PlayerEndpoint got released on the client side, all sockets on the server side are closed.

What happens instead?
The number of file descriptors increases by 2 for every created PlayerEndpoint

Does it happen with one of the tutorials?
Yes

Please provide any additional information below.

[denis-ignatenko]

Can confirm same with PlayerEndpoint in case of only playing incoming video stream to webrtc. No Java. Kurento installed on CentOS 7.

Kurento Media Server version: 6.7.0-dev
Found modules:
'core' version 6.7.0-dev
'elements' version 6.7.0-dev
'filters' version 6.7.0-dev

[zhao85]

same with the newest 6.11.0 release

[zhao85]

I've made a pull request here Kurento/kms-elements#18.
After some stress testing with it, it's more stable now.

[j1elo]

This should be closed by Kurento/kms-elements#18