HMM related use-after-free with amdgpu

[Michel Dänzer]

With a KASAN enabled kernel built from amd-staging-drm-next, the
attached use-after-free is pretty reliably detected during a piglit gpu run.

Any ideas?


P.S. With my standard kernels without KASAN (currently 5.2.y + drm-next
changes for 5.3), I'm having trouble lately completing a piglit run,
running into various issues which look like memory corruption, so might
be related.

-- 
Earthling Michel Dänzer               |              https://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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