https://bugs.freedesktop.org/show_bug.cgi?id=91322
--- Comment #8 from Sergey Kondakov virtuousfox@gmail.com --- (In reply to Alex Deucher from comment #1)
Please attach your full dmesg output. Can you also provide the application log from and options used to decode?
For some reason I couldn't reproduce the complete crash with a player this time but I've managed to consistently and immediately crash the driver with playing http://thedailyshow.cc.com/videos/vbp8i5/living-in-denali in the Firefox with chromium-pepper-flash-18.0.0.160 + freshplayerplugin-0.3.1 while its "enable_hwdec" option is set. All with LIBVA_DRIVER_NAME=gallium
However, I also managed to hang X (picture is stuck but zapping combination works and brings the new one back) by running 'env LIBVA_DRIVER_NAME=gallium VDPAU_DRIVER=va_gl mpv -vo opengl --hwdec=vdpau' which needs https://github.com/i-rinat/libvdpau-va-gl from the creator of freshplayerplugin.
Here's some logs.