[Bug 773546] New: double free or corruption when running parallel vaapi encoders in a loop

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773546

            Bug ID: 773546
           Summary: double free or corruption when running parallel vaapi
                    encoders in a loop
    Classification: Platform
           Product: GStreamer
           Version: 1.9.90
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 338533
  --> https://bugzilla.gnome.org/attachment.cgi?id=338533&action=edit
test program

Generate a sample file:

$ gst-launch-1.0 videotestsrc num-buffers=292 pattern=smpte ! video/x-raw\,\
format\=\(string\)NV12\,\ width\=\(int\)1920\,\ height\=\(int\)1080\,\
framerate\=\(fraction\)30/1 ! filesink location=/tmp/buf.raw

Run the following in a loop

$ gst-launch-1.0 -f filesrc location=/tmp/buf.raw blocksize=3110400 !
videoparse width=1920 height=1080 framerate=30 format=nv12 ! tee name=encoder !
queue name=enc_1 max-size-buffers=1 ! vaapih264enc rate-control=2 bitrate=20000
keyframe-period=30 ! fakesink encoder. ! queue name=enc_2 max-size-buffers=1 !
vaapih264enc rate-control=2 bitrate=20000 keyframe-period=30 ! fakesink
encoder. ! queue name=enc_3 max-size-buffers=1 ! vaapih264enc rate-control=2
bitrate=20000 keyframe-period=30 ! fakesink
Unrepairable overflow!
Unrepairable overflow!
Unrepairable overflow!
Unrepairable overflow!

After some time:

*** Error in `gst-launch-1.0': double free or corruption (fasttop):
0x00007f5b380011e0 ***

Also noticed with vaapivp8enc.

To reproduce, run attached script

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