GPU hang trying to run OpenCL kernels on x86_64

[Luís Mendes]

Hi Michel,

Just made a fresh Ubuntu 18.04 LTS install for armhf with ubuntu
default mesa, libdrm and libclc, with the same 4.16.7 kernel and it
runs fine with the OpenCL applications that cause the hang on x86_64.
So it is surely a kernel or mesa issue exclusive to x86_64, libraries
versions are the same on both systems now, as well as the kernel.
I have even tried amdgpu-pro-18.20 with ubuntu 18.04 on x86_64 and it
hangs just the same.

Regards,
Luís

On Mon, May 7, 2018 at 1:31 PM, Luís Mendes <luis.p.mendes at gmail.com> wrote:
> Hi Michel,
>
> No, I haven't tried the exact same versions of Mesa, nor libclc, nor
> LLVM on x86, however on armhf I have been able to use several
> combinations of Linux kernel versions and mesa versions which are able
> to run the OpenCL kernels in question. I will try to see if the same
> happens with the exact same Ubuntu 18.04 LTS base installation on
> armhf, but won't be able to test it today.
>
> Luís
>
> On Mon, May 7, 2018 at 10:38 AM, Michel Dänzer <michel at daenzer.net> wrote:
>> On 2018-05-05 01:15 AM, Luís Mendes wrote:
>>>
>>> - On another system with armhf 32 bits, 1GB ram, 512GB SSD, AMD RX 480
>>> or AMD RX 550
>>>   with Ubuntu 17.10, vanilla kernel 4.16.7, mesa-18.0.2,
>>> libdrm-2.4.92-git, libclc-git at commit
>>> 3d994f2ff2cbb4531223fe2657144cb19f0c5328 (15/Nov/2017)
>>>
>>>   The kernels work properly on the same AMD cards.
>>
>> Have you tried those exact same versions of the kernel, Mesa, libclc and
>> LLVM on x86?
>>
>>
>> --
>> Earthling Michel Dänzer               |               http://www.amd.com
>> Libre software enthusiast             |             Mesa and X developer