crash at `kurento::MediaElementImpl::mediaFlowInStateChange`

[darrenhp]

Prerequisites

• [x] I have read the SUPPORT document

  
  root@kurento-online-bj-2020061005:/var/crash/1# apt list|grep kurento-dbg

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

kurento-dbg/bionic 6.14.0-0kurento1.18.04 amd64

* [x] I have checked the Troubleshooting Guide
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* [] I have tested with the latest version of Kurento
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## Issue description
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Segmentation fault (thread 140681564055296, pid 9488) Stack trace: [nss_passwd_lookup] sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S:244 [std::cxx11::basic_string<char, std::char_traits, std::allocator >::compare(std::cxx11::basic_string<char, std::char_traits, std::allocator > const&) const] /usr/lib/x86_64-linux-gnu/libstdc++.so.6:0x126AC8 [std::_Rb_tree<std::cxx11::basic_string<char, std::char_traits, std::allocator >, std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr >, std::_Select1st<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > >, std::less<std::cxx11::basic_string<char, std::char_traits, std::allocator > >, std::allocator<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > > >::_M_get_insert_hint_unique_pos(std::_Rb_tree_const_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > >, std::cxx11::basic_string<char, std::char_traits, std::allocator > const&)] /usr/include/c++/7/bits/stl_tree.h:2152 [std::_Rb_tree_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > > std::_Rb_tree<std::cxx11::basic_string<char, std::char_traits, std::allocator >, std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr >, std::_Select1st<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > >, std::less<std::cxx11::basic_string<char, std::char_traits, std::allocator > >, std::allocator<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > > >::_M_emplace_hint_unique<std::piecewise_construct_t const&, std::tuple<std::cxx11::basic_string<char, std::char_traits, std::allocator > const&>, std::tuple<> >(std::_Rb_tree_const_iterator<std::pair<std::cxx11::basic_string<char, std::char_traits, std::allocator > const, std::shared_ptr > >, std::piecewise_construct_t const&, std::tuple<std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&>&&, std::tuple<>&&) [clone .isra.449]] /usr/include/c++/7/bits/stl_tree.h:2404 [kurento::MediaElementImpl::mediaFlowInStateChange(int, char, KmsElementPadType)] /usr/include/c++/7/bits/stl_map.h:493 [void kurento::signal_handler_adaptor<void, _GstElement, int, char, KmsElementPadType>(_GstElement, int, char, KmsElementPadType, void)] /usr/include/c++/7/bits/shared_ptr_base.h:684 [g_closure_invoke] gobject/gclosure.c:811 (discriminator 2) [accumulate] gobject/gsignal.c:3140 [g_signal_emit_valist] gobject/gsignal.c:3419 (discriminator 1) [g_signal_emit] gobject/gsignal.c:3449 [check_if_flow_media] ./src/gst-plugins/commons/./src/gst-plugins/commons/kmselement.c:616 [g_timeout_dispatch] glib/gmain.c:4653 [g_main_dispatch] glib/gmain.c:3180 [g_main_context_iterate] glib/gmain.c:3902 [g_main_loop_run] glib/gmain.c:4097 [loop_thread_init] ./src/gst-plugins/commons/./src/gst-plugins/commons/kmsloop.c:105

## Context
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## How to reproduce?
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I don't know

## Expected & current behavior
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## (Optional) Possible solution
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### INFO about Kurento Media Server

* Kurento version:  6.14.0
* Server OS:        18.04 (Bionic)
* Installation method:
    <!-- Fill with an 'X' in all the boxes that apply. -->
  - [x] apt-get
    <!-- https://doc-kurento.readthedocs.io/en/latest/user/installation.html#installation-local -->
  - [] Docker
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  - [] AWS
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  - [] Built from sources
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### INFO about your Application Server

* Language:                Java
* Kurento Client version:   <!-- E.g. 6.12.0, nightly -->

### INFO about end-user clients

* Device(s):    <!-- E.g. PC, Mac, Android, iPhone, etc. -->
* OS(es):       <!-- E.g. Ubuntu 18.04, Windows 10, iOS 12, etc. -->
* Browser(s):   <!-- E.g. Firefox 74, Chrome 80, Safari 12.0, etc. -->

## INFO about your environment
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the issue. Include things like:
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### Commands output
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Kurento Media Server is running.

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root@kurento-online-bj-2020061005:/var/crash/1# kurento-media-server --version Kurento Media Server version: 6.14.0 Found modules: 'core' version 6.14.0 'elements' version 6.14.0 'filters' version 6.14.0 root@kurento-online-bj-2020061005:/var/crash/1# root@kurento-online-bj-2020061005:/var/crash/1# dpkg -l | grep -Pi 'kurento|kms-|gst.*1.5|nice' ii gstreamer1.5-libav:amd64 1.8.1-1kurento1.18.04 amd64 libav plugin for GStreamer ii gstreamer1.5-nice:amd64 0.1.17-0kurento1.18.04 amd64 ICE library (GStreamer 1.5 plugin) ii gstreamer1.5-plugins-bad:amd64 1.8.1-1kurento4.18.04 amd64 GStreamer plugins from the "bad" set ii gstreamer1.5-plugins-base:amd64 1.8.1-1kurento2.18.04 amd64 GStreamer plugins from the "base" set ii gstreamer1.5-plugins-good:amd64 1.8.1-1kurento4.18.04 amd64 GStreamer plugins from the "good" set ii gstreamer1.5-plugins-ugly:amd64 1.8.1-1kurento1.18.04 amd64 GStreamer plugins from the "ugly" set ii gstreamer1.5-pulseaudio:amd64 1.8.1-1kurento4.18.04 amd64 GStreamer plugin for PulseAudio ii kms-core 6.14.0-0kurento1.18.04 amd64 Kurento Core module ii kms-elements 6.14.0-0kurento1.18.04 amd64 Kurento Elements module ii kms-filters 6.14.0-0kurento1.18.04 amd64 Kurento Filters module ii kms-jsonrpc 6.14.0-0kurento1.18.04 amd64 Kurento JSON-RPC library ii kmsjsoncpp 1.6.3-1kurento1.18.04 amd64 Kurento jsoncpp library ii kurento-media-server 6.14.0-0kurento1.18.04 amd64 Kurento Media Server ii libgstreamer-plugins-bad1.5-0:amd64 1.8.1-1kurento4.18.04 amd64 GStreamer development files for libraries from the "bad" set ii libgstreamer-plugins-base1.5-0:amd64 1.8.1-1kurento2.18.04 amd64 GStreamer libraries from the "base" set ii libgstreamer1.5-0:amd64 1.8.1-1kurento2.18.04 amd64 Core GStreamer libraries and elements ii libnice10:amd64 0.1.17-0kurento1.18.04 amd64 ICE library (shared library) ii libsrtp0:amd64 1.6.0-0kurento1.18.04 amd64 Secure RTP (SRTP) and UST Reference Implementations - shared library ii libusrsctp 0.9.2-1kurento1.18.04 amd64 sctp-refimpl library ii openh264 1.4.0-1kurento1.18.04 amd64 OpenH264 library ii openh264-gst-plugins-bad-1.5:amd64 1.8.1-1kurento4.18.04 amd64 GStreamer plugins from openh264 ii openwebrtc-gst-plugins 0.10.0-1kurento1.18.04 amd64 OpenWebRTC specific GStreamer plugins root@kurento-online-bj-2020061005:/var/crash/1#

[github-actions[bot]]

Hello @darrenhp! :wave: we're sorry you found a bug... so first of all, thank you very much for reporting it.

However, your report doesn't follow the issue template, so it is being automatically closed. We are really sorry for that, but we need all reports to follow the template, or else it won't be possible to understand and help with all issues.

Please, create a new issue following the template, or reopen this same issue to edit and provide all required information.

[github-actions[bot]]

Hello @darrenhp! :wave: we're sorry you found a bug... so first of all, thank you very much for reporting it.

To know about progress, check in Triage. All issues are considered Backlog Candidates until work priorities align and the issue is selected for development. It will then become part of our official Backlog.

[j1elo]

reopening because it seems valid

[j1elo]

Please see if you can get a crash report from /var/crash (read the docs about important info), or a gdb backtrace. The log by itself doesn't look like it contains enough information, now that I've had a look at it

[darrenhp]

Please see if you can get a crash report from /var/crash (read the docs about important info), or a gdb backtrace. The log by itself doesn't look like it contains enough information, now that I've had a look at it

$ ulimit -c
1024000

May be the limit is not enough, there is no core file in the _usr_bin_kurento-media-server.1000.crash