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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98904] valgrind error in gfc_trans_assignment_1 during
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Date: Wed, 03 Feb 2021 14:09:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98904

--- Comment #10 from David Binderman <dcb314 at hotmail dot com> ---
I added the debug lines

  fprintf( stderr, "%d\n", flag_coarray);
  fprintf( stderr, "%d\n", lhs_caf_attr.codimension);
  fprintf( stderr, "%d\n", rhs_caf_attr.codimension);
  fprintf( stderr, "%d\n", lhs_caf_attr.allocatable);
  fprintf( stderr, "%d\n", lhs_refs_comp);
  fprintf( stderr, "%d\n", rhs_caf_attr.allocatable);
  fprintf( stderr, "%d\n", rhs_refs_comp);

around line 11320 of file trans-expr.c, recompiled and re-ran the test.

The output from stderr is=20

=3D=3D44799=3D=3D Conditional jump or move depends on uninitialised value(s)
=3D=3D44799=3D=3D    at 0x525DE53: __vfprintf_internal (in /usr/lib64/libc-=
2.32.so)
=3D=3D44799=3D=3D    by 0x525EA6B: buffered_vfprintf (in /usr/lib64/libc-2.=
32.so)
=3D=3D44799=3D=3D    by 0x52491D9: fprintf (in /usr/lib64/libc-2.32.so)
=3D=3D44799=3D=3D    by 0xFE3B61: gfc_trans_assignment_1(gfc_expr*, gfc_exp=
r*, bool,
bool, bool, bool) (trans-expr.c:11321)

Line 11321 is the second line of debug, so valgrind says
lhs_caf_attr.codimension is uninitialised.

I also got valgrind output for lines 11322, 11323 and 11325.

So it looks to me like the codimension fields and the allocatable
fields are not initialised in this case.

The next stage may be to find out where those fields are supposed
to be initialised and find out why they aren't getting done.

I have no familiarity with fortran or its compiler. Perhaps
someone would be kind enough to point me in the right direction ?=