Fix a bug in the marktask. Can't call cell_is_active_stars() if we are running...

Fix a bug in the marktask. Can't call cell_is_active_stars() if we are running with MPI and ext potential.

src/engine_marktasks.c

@@ -182,8 +182,10 @@ void engine_marktasks_mapper(void *map_data, int num_elements,
       const int cj_active_hydro = cell_is_active_hydro(cj, e);
       const int ci_active_gravity = cell_is_active_gravity(ci, e);
       const int cj_active_gravity = cell_is_active_gravity(cj, e);
-      const int ci_active_stars = cell_is_active_stars(ci, e);
-      const int cj_active_stars = cell_is_active_stars(cj, e);
+
+      // MATTHIEU: This is broken here. In cases with ext-potential this crashes.
+      const int ci_active_stars = 0;  // cell_is_active_stars(ci, e);
+      const int cj_active_stars = 0;  // cell_is_active_stars(cj, e);
 
       /* Only activate tasks that involve a local active cell. */
       if ((t_subtype == task_subtype_density ||

[Matthieu Schaller]

@lhausammann, please see #493 (closed).