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Multiple Xorg restarts leads to `Surface: can not attach plane_state` (raven ridge)

Submitted by ojab @ojab

Assigned to Default DRI bug account

Link to original bug (#106285)

Description

Raven ridge APU (2400g), no external GPU, linux-4.17-rc2, libdrm-2.4.91, mesa-18.1.0-rc1, xorg-server-1.19.6, xf86-video-amdgpu-18.0.1.

So I've tried to reproduce https://bugs.freedesktop.org/show_bug.cgi?id=106276 using simple script:

#!/bin/sh<br>
set -ex<br>
while true; do<br>
    set -x<br>
    X&<br>
    XPID=$!<br>
    sleep 1<br>
    kill ${XPID}<br>
    sleep 1<br>
done<br>
```<br>
<br>
and ended up with screen showing nothing (i. e. backlight enabled, but all image is black) in both console & X. dmesg is full of<br>
[Fri Apr 27 16:17:33 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000a97ad24a! Maximum is: 4<br>
[Fri Apr 27 16:17:33 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000d38d9362! Maximum is: 4<br>
[Fri Apr 27 16:17:33 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000d38d9362! Maximum is: 4<br>
[Fri Apr 27 16:17:33 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000d38d9362! Maximum is: 4<br>
[Fri Apr 27 16:18:01 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000b7ff318d! Maximum is: 4<br>
[Fri Apr 27 16:18:04 2018] [drm:dc_add_plane_to_context [amdgpu]] *ERROR* Surface: can not attach plane_state 00000000b7ff318d! Maximum is: 4