[Bug 789143] New: Occasional deadlock in gst_element_set_state

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789143

            Bug ID: 789143
           Summary: Occasional deadlock in gst_element_set_state
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: hk at getslash.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 361799
  --> https://bugzilla.gnome.org/attachment.cgi?id=361799&action=edit
full backtrace of all threads

In a 1.8.3 based installation we see occasional deadlocks during shutdown of
our playback pipe in gst_element_set_state. Occasional means: on >1k
installations <10 times a day. And seems it happens only on certain streams
(720p live IP-TV streams with occasional network hickups). That means we can't
reliably reproduce.

I know this is 1.8.x and pretty old, but prior to upgrading to 1.12 we'd like
to figure out if we can expect this to be fixed in 1.12 or if we have to
further dig.

Full backtrace attached. Seems like this is an issue between Thread 31 and
Thread 1. Therefore tentatively assigned to component gstreamer-vaapi.

We checked git log 1.8.3..1.12.3 of gstreamer-vaapi (and gstpad.c) and did at a
first look not find anything related.

Would help if you could have a quick look at the bt and tell whether there is
an obvious problem and in which direction we should continue.

Thanks!

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