First bad commit:
Author: Marek Olšák <email@example.com>
Date: Thu Feb 7 00:01:13 2019 -0500
radeonsi: always use compute rings for clover on CI and newer (v2)
initialize all non-compute context functions to NULL.
v2: fix SI
hangs on carrizo, iceland, raven. The benchmark can be stopped using crtl+c, but the system is unstable after; won't suspend, hangs on reboot.
see also: https://lists.freedesktop.org/archives/mesa-dev/2019-March/216042.html
Fixed by https://cgit.freedesktop.org/mesa/mesa/commit/?id=7be26976b8e8bc34fa7d55550014197ed2af488f