[Bug 755342] New: element: state_change may fail because of release_request_pad (racy)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755342

            Bug ID: 755342
           Summary: element: state_change may fail because of
                    release_request_pad (racy)
    Classification: Platform
           Product: GStreamer
           Version: 1.5.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: stian.selnes at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: gstreamer at pexip.com
     GNOME version: ---

gst_element_state_change() may unexpectedly fail if the element is releasing a
request pad simultaneously.

gst_element_state_change() will iterate over the pads and activate/deactivate.
If the timing is unfortunate and the pad is deactivated and removed (from
release_pad function) after the iterator is created and while activate_pads()
is called, gst_pad_set_active() may be called from activate_pads() on a pad
with no parent causing gst_element_state_change() to return
GST_STATE_CHANGE_FAILURE.

This may happen on both activation and deactivation from
gst_element_state_change().

This behavior has changed since 0.10 since no parent was needed then.

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