X.Org Server terminate when I close VLC (OpenGL GLX video output).
This issue not reproducible when VLC doesn't playback anything. So only closing
player that still playback video trigger issue.
Issue reproducible not every time (around 1 of 10 closing VLC get X.Org Server
termination).
Issue tested only on integrated GPU (Radeon HD 6620G).

Kubuntu 13.04 x86_64
Linux 3.8rc6 (with Linux 3.7 is also reproducible).
Mesa: 9.0.2 (with 9.1 is also reproducible)
libdrm-radeon1: 2.4.41
xserver-xorg-video-radeon: 7.1.0
xserver-xorg-core: 1.13.2
KDE 4.9.98 (4.10rc3)