KASAN caught amdgpu / HMM use-after-free

[Michel Dänzer]

See the attached dmesg excerpt. I've hit this a few times running piglit
with amd-staging-drm-next, first on February 22nd.

The memory was freed after calling hmm_mirror_unregister in
amdgpu_mn_destroy.


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