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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99711] Crash when reading an allocated character array
 in namelist
Date: Tue, 23 Mar 2021 06:16:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99711

--- Comment #5 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Tue, Mar 23, 2021 at 02:41:27AM +0000, jvdelisle at gcc dot gnu.org wrot=
e:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99711
>=20
> --- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
> Setting the character length in the type spec enables this to run correct=
ly, so
> the string length is not getting set correctly in the allocate statement.
>=20
> program allocnml
>   implicit none
>=20
>   character(len=3D10), dimension(:), allocatable :: cbulist_ru ! set here
>   integer :: iluseg
>=20
>   namelist /nam_bu_ru/ cbulist_ru
>=20
>   allocate( character(len=3D10) :: cbulist_ru(5) )
>=20
>   open(newunit=3Diluseg, file=3D'list.nml', status=3D'old', &
>        action=3D'read', form=3D'formatted', access=3D'sequential')
>=20
>   read(unit=3Diluseg, nml=3Dnam_bu_ru)
>=20
>   print *, cbulist_ru
>=20

I don't use namelist, so will defer to you on the details.
I input file only defines cbulist_ru(1) through cbulist_ru(4),
so the namelist initializes only an array section.  If that
is conforming, then technically the print statement is invalid,
because cbulist_ru(5) is uninitialized.=