[Bug 765324] New: segfault in libgstcompositor.so

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765324

            Bug ID: 765324
           Summary: segfault in libgstcompositor.so
    Classification: Platform
           Product: GStreamer
           Version: 1.8.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bill-auger at programmer.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

this segfault has been present in my app since GStreamer 1.6.0 but appeared
only rarely - with GStreamer v1.8.0 it occurs 100% of the time

here is a link to a gist with a thread backtrace and valgrind report (the last
file named libgstcompositor-so-segfault-v1-8-0-md) -->
https://gist.github.com/bill-auger/a5184be29ddf89e14f97#file-libgstcompositor-so-segfault-v1-8-0-md

my first attempt at an isolated test case to expose this bug was not successful
- for now these are the steps to reproduce:

$ git clone https://github.com/bill-auger/av-caster.git
$ sudo apt-get install build-essential libfreetype6-dev                  \
                       libgstreamer-plugins-base1.0-dev libircclient-dev \
                       libx11-dev libxcursor-dev libxinerama-dev
$ sudo apt-get install freeglut3 gstreamer1.0-alsa gstreamer1.0-plugins-bad \
                       gstreamer1.0-plugins-good gstreamer1.0-plugins-ugly  \
                       gstreamer1.0-pulseaudio libfreetype6 libgl1-mesa-glx \
                       libircclient1 libx11-6 libxcomposite1 libxcursor1    \
                       libxext6 libxinerama1 libxrender1
$ cd av-caster/Builds/Makefile
$ make
$ build/av-caster-dbg

NOTE: unfortunately the install location for libircclient is not consistent
across platforms - if your compiler can not find the headers on your system you
can:
$ sudo mkdir /usr/include/libircclient
$ sudo cp  /usr/include/libirc* /usr/include/libircclient/

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