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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: Wed, 24 Mar 2021 05:35:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99711

--- Comment #9 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Wed, Mar 24, 2021 at 02:41:08AM +0000, jvdelisle at gcc dot gnu.org wrot=
e:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99711
>=20
> --- Comment #7 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
> Digging further within gfc_resolve_dt which is resolving the READ stateme=
nt,
> one can find:
>=20
> (gdb) p *e->symtree.n.sym.ts.u.cl
> $31 =3D {length =3D 0x0, next =3D 0x0, length_from_typespec =3D false, ba=
ckend_decl =3D
> 0x0,=20
>   passed_length =3D 0x0, resolved =3D 1}
>=20
> e is the gfc_expr for cbulist_ru in the test case
>=20
> I have checked both the gfc_expr itself and it's symtree and in all cases=
 the
> character length is NULL, not being intialized.  I suspect it is getting =
missed
> in the resolution of the allocate statement.  At this point in gfc_resolv=
e_dt
> it is marked as having been resolved.
>=20

What does -ftree-dump-original show?  I wonder if gfortran is doing a
re-allocation on assignment when it shouldn't.=