https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90813
--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> --- (In reply to Dominique d'Humieres from comment #1) > See also https://gcc.gnu.org/ml/fortran/2019-06/msg00034.html. I have responded to Christophe on the above thread to the effect that I cannot see anything that would give rise to this on x86_64. Valgrind gives the runtime a clean bill of health - no unused variables being used nor mismatches in word lengths. Can you do some debugging for me? Thanks Paul