https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108056
--- Comment #2 from Gilles Gouaillardet <gilles.gouaillardet at gmail dot com> --- ubuntu does not ship libgfortran.so from gfortran-11. I tried on a RedHat box, and the issue only occurs when - I compile with gfortran-11 - *and* I force libgfortran-12 (so if i use the same gfortran and libgfortran versions, there is no issue). Here is a stack trace in these conditions: #0 0x00002aaaaba2dd70 in _exit () from /lib64/libc.so.6 #1 0x00002aaaab9a1cab in __run_exit_handlers () from /lib64/libc.so.6 #2 0x00002aaaab9a1d37 in exit () from /lib64/libc.so.6 #3 0x00002aaaaacf0976 in _gfortrani_exit_error (status=3) at ../../../../src/gcc-12.1.0/libgfortran/runtime/error.c:218 #4 0x00002aaaaacf12af in _gfortrani_internal_error (cmp=0x0, message=0x2aaaaafdf2a5 "Invalid type in descriptor") at ../../../../src/gcc-12.1.0/libgfortran/runtime/error.c:534 #5 0x00002aaaaaf787e2 in _gfortran_gfc_desc_to_cfi_desc (d_ptr=0x7fffffffcfa8, s=0x7fffffffcfd0) at ../../../../src/gcc-12.1.0/libgfortran/runtime/ISO_Fortran_binding.c:219 #6 0x0000000000400808 in pub_f08ts (a=<unknown type in /home/usersup/gilles/build/gcc-11.3.0/x86_64-pc-linux-gnu/libgfortran/a.out, CU 0x0, DIE 0xc1>, b=<unknown type in /home/usersup/gilles/build/gcc-11.3.0/x86_64-pc-linux-gnu/libgfortran/a.out, CU 0x0, DIE 0xce>) at /home/usersup/gilles/y.f90:29 #7 0x00000000004007ad in bugsub (a=1, b=-3.67578065e-13) at /home/usersup/gilles/y.f90:35 #8 0x00000000004008d0 in bug () at /home/usersup/gilles/y.f90:43 #9 0x0000000000400907 in main (argc=1, argv=0x7fffffffd4cd) at /home/usersup/gilles/y.f90:44 #10 0x00002aaaab98a555 in __libc_start_main () from /lib64/libc.so.6 #11 0x0000000000400699 in _start () FWIW, here is the value of s when _gfortran_gfc_desc_to_cfi_desc is invoked (gdb) p *s $6 = {base_addr = 0x7fffffffd04c, offset = 38, dtype = {elem_len = 4, version = 0, rank = 0 '\000', type = 11 '\v', attribute = 2}, span = 4, dim = 0x7fffffffcff8} I also noted that if the reproducer is built with gcc-12, _gfortran_gfc_desc_to_cfi_desc() is not invoked at all.