I get multiple of these:

392.377183] amdgpu 0000:09:00.0: [gfxhub] VMC page fault (src_id:0 ring:24
vmid:5 pasid:32772, for process firefox pid 4467 thread firefox:cs0 pid 4565
               )
[  392.377194] amdgpu 0000:09:00.0:   at address 0x00000001013d4000 from 27
[  392.377200] amdgpu 0000:09:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x00501031

(...)

[  402.621544] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
signaled seq=28019, emitted seq=28022
[  402.621551] [drm] GPU recovery disabled.

Fedora 30 on Gigabyte X470 AORUS ULTRA GAMING w/ AMD Ryzen 5 2400G with Radeon
Vega Graphics running git mesa and git xf86-video-amdgpu.