https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64888
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Started looking into this. Seems that we should handle specially those artificial ubsan decls such as *.Lubsan_data in omp_default_clause, i.e. treat them as shared? But I hardly know what I'm talking about; inviting Jakub to comment.
