https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108109
anlauf at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2022-12-14 Status|UNCONFIRMED |NEW --- Comment #3 from anlauf at gcc dot gnu.org --- On my system I don't see glibc complaining, independent of MALLOC_PERTURB_=, however, with valgrind I do get an invalid read slightly deeper down, in ==21865== Invalid read of size 8 ==21865== at 0x95AD7D: add_dt_to_dt_list (resolve.cc:14470) ==21865== by 0x95AD7D: add_dt_to_dt_list (resolve.cc:14464) ==21865== by 0x95AD7D: resolve_fl_derived0(gfc_symbol*) [clone .part.0] (resolve.cc:15152) (Note the line numbers may slightly differ from yours.) So confirmed.