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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/98904] valgrind error in gfc_trans_assignment_1 during
 bootstrap
Date: Mon, 01 Feb 2021 09:06:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98904

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
The code has:

 ... lhs_refs_comp =3D false, rhs_refs_comp =3D false
...
  if (flag_coarray =3D=3D GFC_FCOARRAY_LIB)
    {
      lhs_caf_attr =3D gfc_caf_attr (expr1, false, &lhs_refs_comp);
      rhs_caf_attr =3D gfc_caf_attr (expr2, false, &rhs_refs_comp);
    }
...

And the error "Conditional jump or move depends on uninitialised value(s)"
points, as you wrote, to the second line of

  else if (flag_coarray =3D=3D GFC_FCOARRAY_LIB
           && lhs_caf_attr.codimension && rhs_caf_attr.codimension
           && ((lhs_caf_attr.allocatable && lhs_refs_comp)
               || (rhs_caf_attr.allocatable && rhs_refs_comp)))

However, the code looks perfectly fine to me.=