In the range a337a0c8..a6a687b1 is a commit that regresses a ton of RADV tests on vangogh.
This manifests as
[ 89.142364] [drm:amdgpu_job_timedout] *ERROR* ring gfx_0.0.0 timeout, signaled seq=57612, emitted seq=57614
[ 89.142394] [drm:amdgpu_job_timedout] *ERROR* Process information: process deqp-vk pid 7477 thread deqp-vk pid 7477
[ 89.245239] amdgpu 0000:04:00.0: amdgpu: SMU: unknown command: index:81 param:0x00000000 message:GetGfxOffEntryCount
followed by a ton of tests getting DEVICE_LOST.
See these jobs for instance: