[Bug 111921] GPU crash on VegaM (amdgpu: The CS has been rejected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111921

            Bug ID: 111921
           Summary: GPU crash on VegaM (amdgpu: The CS has been rejected)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rverschelde at gmail.com

Created attachment 145680
  --> https://bugs.freedesktop.org/attachment.cgi?id=145680&action=edit
dmesg output after GPU crash with "amdgpu: The CS has been rejected"

Might be related to bug 111860.

In my case, the GPU crashes or fails to resume when I use the Godot Engine FOSS
application: https://github.com/godotengine/godot

The application works fine for a time, but eventually it will freeze and this
gets printed to the terminal:

amdgpu: The CS has been rejected, see dmesg for more information (-2).
amdgpu: The CS has been rejected, see dmesg for more information (-19).

(attaching dmesg)

At this point, I have to kill the application, and reboot if I want to use the
GPU again.

This seems to happen mainly when alt-tabbing between Godot and the desktop or
terminal (both of which run on the Intel HD 630 IGP), so it might be an issue
with context switching?

I don't have precise steps to reproduce yet apart from using Godot (debug build
from git master branch) and other applications in parallel, to eventually see
it crash within 5-10 min.

I *think* the bug started to happen when I upgraded to kernel 5.2.x (now
running 5.3.2, still having the bug). That's what bug 111860 claims too, so
I'll attempt running 5.1.20 for a while to see if the bug still happens.

System info:

$ inxi
CPU: Quad Core Intel Core i7-8705G (-MT MCP-) speed/min/max: 1347/800/4100 MHz
Kernel: 5.3.2-desktop-1.mga7 x86_64 Up: 2h 44m 
Mem: 3451.1/15767.7 MiB (21.9%) Storage: 953.87 GiB (58.3% used) Procs: 241
Shell: bash 4.4.23 inxi: 3.0.33 
$ inxi -G
Graphics:  Device-1: Intel HD Graphics 630 driver: i915 v: kernel 
           Device-2: Advanced Micro Devices [AMD/ATI] Polaris 22 XL [Radeon RX
Vega M GL] driver: amdgpu v: kernel 
           Display: x11 server: Mageia X.org 1.20.4 driver: amdgpu,intel
FAILED: ati unloaded: fbdev,modesetting,vesa tty: N/A 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v:
4.5 Mesa 19.1.7

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