Created attachment 145326 [details]
umr output of sdma0/sdma1 after RotTR freeze

Applied the provided WIP patch to linux-mainline 5.3-rc8 and started RotTR
again in order to trigger a system freeze.
This time I also got a ring sdma0 and sdma1 timeout:

[  632.175837] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for
fences timed out or interrupted!
[  632.175973] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for
fences timed out or interrupted!
[  637.299049] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0
timeout, signaled seq=313757, emitted seq=313759
[  637.299110] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information:
process RiseOfTheTombRa pid 2584 thread RiseOfTheT:cs0 pid 2590
[  637.299111] [drm] GPU recovery disabled.
[  646.468871] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma0 timeout,
signaled seq=278259, emitted seq=278263
[  646.468961] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma1 timeout,
signaled seq=21116, emitted seq=21119
[  646.469052] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information:
process  pid 0 thread  pid 0
[  646.469141] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information:
process plasmashell pid 989 thread plasmashel:cs0 pid 1155
[  646.469141] [drm] GPU recovery disabled.
[  646.469142] [drm] GPU recovery disabled.

Stdout of `umr -R sdma0` and `umr -R sdma1` is attached to this post, however,
I also got a couple of stderr messages like "[ERROR]: No valid mapping for
3@800000023f00" which I didn't include in the output.