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core/include/traccc/fitting/kalman_filter/kalman_fitter.hpp

@@ -254,6 +254,11 @@ class kalman_fitter {
 
         } else {
 
+            // @NOTE: There is no backward filter in RTS smoother so there
+            // is no backward chi2 either. We just put the forward chi2 into
+            // backward chi2 for the pvalue test
+            last.backward_chi2() = last.filtered_chi2();
+
             for (typename vector_type<
                      track_state<algebra_type>>::reverse_iterator it =
                      track_states.rbegin() + 1;
@@ -264,6 +269,8 @@ class kalman_fitter {
                                                   it->surface_link()};
                 sf.template visit_mask<gain_matrix_smoother<algebra_type>>(
                     *it, *(it - 1));
+
+                it->backward_chi2() = it->filtered_chi2();
             }
         }
     }