bug in field versioning pass about dawn HOT 2 OPEN

/code/clang-gridtools_new/benchmarks/../src/dycore/horizontal_diffusion_type2_single.cpp:75:7: error: unresolvable race-condition in statement
      const double delta_flux_y =

stencil_function avg {
  offset off;
  storage in;

  Do { return 0.5 * (in[off] + in); }
};

stencil_function delta {
  offset off;
  storage data;

  Do { return data[off] - data; }
};

stencil_function laplacian {
  storage data, crlato, crlatv;

  Do {
    return data[i + 1] + data[i - 1] - 2.0 * data +
           crlato * delta(j + 1, data) + crlatv * delta(j - 1, data);
  }
};

stencil_function diffusive_flux_x {
  storage lap, data;

  Do {
    const double flx = delta(i + 1, lap);
    return (flx * delta(i + 1, data)) > 0.0 ? 0.0 : flx;
  }
};

stencil_function diffusive_flux_y {
  storage lap, data, crlato;

  Do {
    const double fly = crlato * delta(j + 1, lap);
    return (fly * delta(j + 1, data)) > 0.0 ? 0.0 : fly;
  }
};

stencil horizontal_diffusion_type2_single {
  storage data, crlato, crlatu, hdmask;
  var lap;

  Do {
    vertical_region(k_start, k_end) {
      lap = laplacian(data, crlato, crlatu);
      const double delta_flux_x = diffusive_flux_x(lap, data) -
                                  diffusive_flux_x(lap[i - 1], data[i - 1]);
      const double delta_flux_y =
          diffusive_flux_y(lap, data, crlato) -
          diffusive_flux_y(lap[j - 1], data[j - 1], crlato[j - 1]);
      data = data - hdmask * (delta_flux_x + delta_flux_y);
    }
  }
};