https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85346
--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- OK, I think I just have gotten closer to what is wrong: $ gfortran -g -O1 -ftree-parallelize-loops=2 do_concurrent_5.f90 $ ./a.out $ gfortran -g -O1 -ftree-parallelize-loops=2 -fopenmp do_concurrent_5.f90 $ ./a.out Speicherzugriffsfehler (Speicherabzug geschrieben) Huh?