Running long lasting OpenCL kernels (e.g. GROMACS with a system of many atoms)
using kernel 4.8.15, Mesa git, and LLVM git on Kabini APU:

vendor_id       : AuthenticAMD
cpu family      : 22
model           : 0
model name      : AMD Athlon(tm) 5350 APU with Radeon(tm) R3
stepping        : 1
microcode       : 0x700010b

with GPU:

00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Kabini [Radeon HD 8400 / R3 Series] [1002:9830]

causes GPU lockups like:

[338584.980657] radeon 0000:00:01.0: ring 0 stalled for more than 10351msec
[338584.980811] radeon 0000:00:01.0: GPU lockup (current fence id
0x00000000000827c1 last fence id 0x00000000000827c2 on ring 0)
[338585.484633] radeon 0000:00:01.0: ring 0 stalled for more than 10855msec
[338585.484789] radeon 0000:00:01.0: GPU lockup (current fence id
0x00000000000827c1 last fence id 0x00000000000827c2 on ring 0)
[338585.988632] radeon 0000:00:01.0: ring 0 stalled for more than 11359msec
[338585.988787] radeon 0000:00:01.0: GPU lockup (current fence id
0x00000000000827c1 last fence id 0x00000000000827c2 on ring 0)

Machine does not hang. This is reliably reproducible. Any other info I can
provide?