[Bug 715175] New: Videomixer : Race bug blend_buffer <-> update_src_caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=715175
  GStreamer | gst-plugins-good | 1.0.8

           Summary: Videomixer : Race bug blend_buffer <-> update_src_caps
    Classification: Platform
           Product: GStreamer
           Version: 1.0.8
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: adrien.schwartzentruber at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=261462)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=261462)
Test application

By running the attached application, you may observe a SIGSEGV fired in
blend_buffers (thread = element) when the update_src_caps is called from the
main context. You may see this segmentation fault after 500 stream switch. 

On my local version (1.0.8), I fixed this bug by moving GST_VIDEO_MIXER2_LOCK
(mix) before the mix variable reset (mix->blend = NULL; mix->overlay =
NULL;mix-fill_checker = NULL;mix->fill_color = NULL;)

By my observation, this should resolve the problem. 


Regards,
Adrien SCHWARTZENTRUBER

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