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e822e51752
A wl_surface may have a wl_subsurface interface, but no buffers attached yet, even though the geometry calculation code for surfaces/subsurfaces assumes everything has already a buffer. Just skip subsurfaces that don't have a buffer, those can't be set a geometry yet, and right now it's crashing accessing the texture from the NULL surface->buffer. https://bugzilla.gnome.org/show_bug.cgi?id=735452