https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102689
--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> --- Created attachment 59839 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59839&action=edit Instrumtented class_transformational_2.f90 Hi Christophe, Would you be so kind as to try compiling and running the attached? My first order guess is that the span of the class data descriptor is being incorrectly calculated. Many thanks for the report. Paul