Memory corruption on host when running gles31 test in the guest

running the test dEQP-GLES31.functional.copy_image.non_compressed.viewclass_48_bits.rgb16i_rgb16i.cubemap_to_texture2d

inside the guest crashes qemu because of a double free/memory corruption. It seems that virglrenderer is not allocating enough memory in vrend_resource_copy_fallback