Created attachment 139407 [details]
dmesg

* Fedora 29 (Rawhide)
* Latest system updates:
 - kernel 4.17.0-0.rc3.git4.1
 - drm 3.25.0
 - mesa 18.1.0-rc2
 - llvm 6.0.0


For reproduction issue:
1) # dnf install gstreamer1-vaapi
2) Play video encoded with H.264 in Totem player

Symptoms:
1. The system stop to respod.

kernel output after GPU hang:
[   89.056879] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
last signaled seq=2638, last emitted seq=2640
[   89.056926] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring uvd timeout,
last signaled seq=80, last emitted seq=82
[   89.056932] [drm] No hardware hang detected. Did some blocks stall?
[   89.056948] [drm] No hardware hang detected. Did some blocks stall?