See also similar report and discussion and patch here: https://gitlab.freedesktop.org/drm/intel/issues/827
Especially the remark "obj->frontbuffer is no longer protected by the struct_mutex".
Are they the upstream? I do not know if this is exactly the same bug as reported here, or whether they are upstream, so I have not set upstream.
Kind regards, -- Ben Caradoc-Davies <b...@transient.nz> Director Transient Software Limited <https://transient.nz/> New Zealand
