Same problem on RX 460 card when running imagemagick's "mogrify" command. I'm
using Arch linux with latest stable version of kernel, mesa, and X.

$ mogrify -resize 400x300 piv.jpg
[ 3091.155960] amdgpu 0000:00:01.0: GPU fault detected: 147 0x04a82002
[ 3091.158201] amdgpu 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x0050
3095
[ 3091.160461] amdgpu 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0A020002
[ 3091.162695] amdgpu 0000:00:01.0: VM fault (0x02, vmid 5, pasid 32781) at
page
 5255317, read from 'TC2' (0x54433200) (32)
[ 3101.279903] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
last
 signaled seq=135372, last emitted seq=135373

Strace of the process shows this call: "ioctl(6, DRM_IOCTL_AMDGPU_WAIT_CS".