sna_dri2_copy_region:1443 assertion 'get_private(src)->bo != get_private(dst)->bo' failed

On current master (846b53da) xf86-video-intel very frequently crashes at random moments with the above assertion.

On normal build: Xorg.0.log.old

Last 1000 lines on build with internal-debug=full (full log is 600MB): Xorg.0.log.old.debug.last1000