Been following this thread for a while now. Can't believe this has been known
for 3 months, without a fix released.

Just a moment ago a random freeze occurred running Firefox and other
applications, no games. Spotify kept playing in the background. Cursor not
moving and unable to open another shell.

This happened with AMD_DEBUG="nongg,nodma" enabled. Running kernel 5.4rc7 and
Mesa 19.2.4.

Here is an output of the log before reboot:

nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0: [gfxhub] page fault
(src_id:0 ring:40 vmid:5 pasid:32769, for process Xorg pid 811 thread Xorg:cs0
pid 974)
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:   in page starting at
address 0x00000318c00e7000 from client 27
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:
GCVM_L2_PROTECTION_FAULT_STATUS:0x00541C51
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MORE_FAULTS:
0x1
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          WALKER_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:         
PERMISSION_FAULTS: 0x5
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MAPPING_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          RW: 0x1
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0: [gfxhub] page fault
(src_id:0 ring:40 vmid:5 pasid:32769, for process Xorg pid 811 thread Xorg:cs0
pid 974)
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:   in page starting at
address 0x00000318c00e6000 from client 27
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:
GCVM_L2_PROTECTION_FAULT_STATUS:0x00000000
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MORE_FAULTS:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          WALKER_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:         
PERMISSION_FAULTS: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MAPPING_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          RW: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0: [gfxhub] page fault
(src_id:0 ring:40 vmid:5 pasid:32769, for process Xorg pid 811 thread Xorg:cs0
pid 974)
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:   in page starting at
address 0x00000318c00e9000 from client 27
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:
GCVM_L2_PROTECTION_FAULT_STATUS:0x00000000
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MORE_FAULTS:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          WALKER_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:         
PERMISSION_FAULTS: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MAPPING_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          RW: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0: [gfxhub] page fault
(src_id:0 ring:40 vmid:5 pasid:32769, for process Xorg pid 811 thread Xorg:cs0
pid 974)
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:   in page starting at
address 0x00000318c00e8000 from client 27
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:
GCVM_L2_PROTECTION_FAULT_STATUS:0x00000000
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MORE_FAULTS:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          WALKER_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:         
PERMISSION_FAULTS: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MAPPING_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          RW: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0: [gfxhub] page fault
(src_id:0 ring:40 vmid:5 pasid:32769, for process Xorg pid 811 thread Xorg:cs0
pid 974)
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:   in page starting at
address 0x00000318c00ea000 from client 27
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:
GCVM_L2_PROTECTION_FAULT_STATUS:0x00000000
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MORE_FAULTS:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          WALKER_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:         
PERMISSION_FAULTS: 0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          MAPPING_ERROR:
0x0
nov 15 20:47:58 sander-pc kernel: amdgpu 0000:0a:00.0:          RW: 0x0
nov 15 20:48:09 sander-pc kernel: [drm:amdgpu_dm_atomic_commit_tail [amdgpu]]
*ERROR* Waiting for fences timed out!
nov 15 20:48:09 sander-pc kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR*
ring sdma1 timeout, signaled seq=6760, emitted seq=6763
nov 15 20:48:09 sander-pc kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR*
Process information: process Xorg pid 811 thread Xorg:cs0 pid 974
nov 15 20:48:09 sander-pc kernel: [drm] GPU recovery disabled.