[Bug 797251] New: webrtcbin: might leak resources when changing to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797251

            Bug ID: 797251
           Summary: webrtcbin: might leak resources when changing to NULL
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: aconchillo at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

If a pipeline that contains a webrtcbin element is set to PLAYING, the
"on-negotiation-needed" is emitted and in the callback we call "create-offer"
which enqueues an internal task (an idle source). Then, while the task is
executing we set the pipeline to NULL. This might not allow the idle source to
complete an all the resources associated to it are lost. The same might be true
for any other webrtcbin tasks (e.g. set-remote-description).

I have an app that creates and destroys webrtcbin and I'm running an stress
test to it. After a while, a bunch of resources (eventfd and network sockets as
well) are leaked.

I don't really have a backtrace or anything I can share right now, but I have
added a bunch of print statements to debug this and understand what's
happening.\.

It might also be that there is something wrong in my application, something I'm
still checking but reading at the code I think something weird is going on.

A bit more about my app. It's an app that might create multiple pipelines (in
my test currently 2) and each of those have a webrtcbin. Then, we might set the
pipelines to NULL at any point, unref them and create new ones, and the same
over and over.

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