Created attachment 136597 [details]
kernel messages

Linux 4.14.0 libdrm 2.4.89 mesa 17.3.1 on Debian

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Baffin [Radeon RX 460] [1002:67ef] (rev cf)

After lockup I see this message:

[150509.194713] amdgpu 0000:01:00.0: GPU fault detected: 147 0x00004802
[150509.194718] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00000000
[150509.194720] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0A048002
[150509.194722] amdgpu 0000:01:00.0: VM fault (0x02, vmid 5) at page 0, read
from 'TC0' (0x54433000) (72)

but similar message earlier did not cause lockup

[112552.659698] amdgpu 0000:01:00.0: GPU fault detected: 147 0x07f04802
[112552.659702] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x0003F8FE
[112552.659704] amdgpu 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0A048002
[112552.659706] amdgpu 0000:01:00.0: VM fault (0x02, vmid 5) at page 260350,
read from 'TC0' (0x54433000) (72)

Earlier versions of kernel+mesa would occasionally lock up displaying garbage
randomly at any time. I have not seen that for a while but the card still
occasionally locks up when running a 3D application. After lock up the card
keeps showing static screen of something the application rendered and movable
cursor. It *seems* to happen most often when there is some setup in progress
like loading a new scene.