#0  pipe_surface_reference (surf=0x0, ptr=0x1d8) at ../../../../../src/gallium/auxiliary/util/u_inlines.h:109
  [Error: u_inlines.h was not found in source tree]
#1  dri_destroy_buffer (dPriv=0x55f8a3bb12c0) at ../../../../../src/gallium/state_trackers/dri/dri_drawable.c:171
  [Error: dri_drawable.c was not found in source tree]
#2  0x00007f99464ae40e in dri_put_drawable (pdp=pdp@entry=0x55f8a3bb12c0) at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:615
  [Error: dri_util.c was not found in source tree]
#3  0x00007f99464ae4c0 in dri_put_drawable (pdp=0x55f8a3bb12c0) at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:598
  [Error: dri_util.c was not found in source tree]
#4  driUnbindContext (pcp=0x55f8a225ca60) at ../../../../../../src/mesa/drivers/dri/common/dri_util.c:583
  [Error: dri_util.c was not found in source tree]
#5  0x00007f994753e455 in MakeContextCurrent (dpy=0x55f8a17e03b0, draw=79696381, read=79696381, gc_user=0x55f8a1b45730) at ../../../src/glx/glxcurrent.c:214
  [Error: glxcurrent.c was not found in source tree]
#6  0x00007f990d28165b in gst_vaapi_window_x11_new_with_xid (display=0x55f8a29b6630, xid=94526368343600) at ../../../../gst-libs/gst/vaapi/gstvaapiwindow_x11.c:601
  [Error: gstvaapiwindow_x11.c was not found in source tree]
#7  0x0000000004c011fd in ?? ()
#8  0x00007f990d4b8ee0 in ?? () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvaapi.so
#9  0x000055f8a1b45730 in ?? ()
#10 0x00007f98f006d250 in ?? ()
#11 0x0e91a5f434406700 in ?? ()
#12 0x000055f8a29b6630 in ?? ()
#13 0x00007f990d251c32 in gst_vaapi_image_copy (dst_image=0x55f8a17e03b0, src_image=0x7f990d4bd100 <g_class+32>) at ../../../../gst-libs/gst/vaapi/gstvaapiimage.c:1023
  [Error: gstvaapiimage.c was not found in source tree]
#14 0x00007f996b011689 in gst_buffer_pool_release_buffer () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#15 0x00007f996b00b0c3 in _gst_buffer_dispose () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#16 0x00007f996b03bd8e in gst_mini_object_unref () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#17 0x00007f996a7d4925 in _cogl_object_default_unref () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libcogl.so.20
#18 0x00007f996a7ea804 in _cogl_object_pipeline_layer_indirect_free () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libcogl.so.20
#19 0x00007f996c7d051d in g_list_foreach () from /tmp/apport_sandbox_TnKhTw/lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f996a7e7137 in _cogl_object_pipeline_indirect_free () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libcogl.so.20
#21 0x00007f996a7e6a68 in _cogl_pipeline_node_unparent_real () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libcogl.so.20
#22 0x00007f996a7e6fd8 in _cogl_object_pipeline_indirect_free () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libcogl.so.20
#23 0x00007f996b594057 in clutter_gst_frame_free (data=0x55f8a39168a0) at ./clutter-gst-types.c:66
  [Error: clutter-gst-types.c was not found in source tree]
#24 0x00007f996cab00db in g_boxed_free () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007f996b59e964 in _new_frame_from_pipeline (sink=<optimized out>, self=0x55f8a1ea8300) at ./clutter-gst-content.c:191
  [Error: clutter-gst-content.c was not found in source tree]
#26 0x00007f996cab21d4 in _g_closure_invoke_va () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x00007f996cacc9a6 in g_signal_emit_valist () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#28 0x00007f996cacd08f in g_signal_emit () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#29 0x00007f996b5a1ba2 in clutter_gst_source_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at ./clutter-gst-video-sink.c:2066
  [Error: clutter-gst-video-sink.c was not found in source tree]
#30 0x00007f996c7d4197 in g_main_context_dispatch () from /tmp/apport_sandbox_TnKhTw/lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f996c7d43f0 in g_main_context_iterate.isra () from /tmp/apport_sandbox_TnKhTw/lib/x86_64-linux-gnu/libglib-2.0.so.0
#32 0x00007f996c7d449c in g_main_context_iteration () from /tmp/apport_sandbox_TnKhTw/lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007f996cda7d7d in g_application_run () from /tmp/apport_sandbox_TnKhTw/usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#34 0x000055f8a06c4db8 in main ()