Created attachment 142974 [details]
journalctl -b of lockup from bisected commit

E585 owner here.  Please let me know if I can provide any additional
information that would be helpful.  Thanks in advance for your help.

This problem was very consistently reproduced during the bisect.  I've attached
a journalctl -b from the first bad commit.  I was able to bisect the problem
to...

284dec4317c8e76f45d3ce922f673c80331812f1 is the first bad commit
commit 284dec4317c8e76f45d3ce922f673c80331812f1
Author: Christian König <christian.koenig@amd.com>
Date:   Wed Aug 22 16:44:56 2018 +0200

    drm/amdgpu: enable GTT PD/PT for raven v3

    Should work on Vega10 as well, but with an obvious performance hit.

    Older APUs can be enabled as well, but will probably be more work.

    v2: fix error checking
    v3: use more general check

    Signed-off-by: Christian König <christian.koenig@amd.com>
    Acked-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>