https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126799
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Mikael Morin <[email protected]>: https://gcc.gnu.org/g:fbc358491eac26f6680d738c59c9ce62564988f6 commit r17-3254-gfbc358491eac26f6680d738c59c9ce62564988f6 Author: Mikael Morin <[email protected]> Date: Thu Aug 13 09:40:14 2026 +0200 fortran: Fix element size in collective subroutines implementation [PR126799] The shared memory implementation of collective subroutines uses the array descriptor span as element size. This gives a bigger value than the true size in some cases, as demonstrated in the testcase with a pointer pointing to an array subreference. The bigger size estimate doesn't only cause over allocation of memory. As the packing and unpacking functions don't have the same problem, they initialize and copy back only a part of the allocated buffer, and their element indexing in the buffer doesn't match that of the collective subroutine, causing wrong values to be produced. PR fortran/126799 libgfortran/ChangeLog: * caf/shmem/collective_subroutine.c (collsub_reduce_array): Use the element length field instead of the span field as element size. gcc/testsuite/ChangeLog: * gfortran.dg/coarray/collectives_5.f90: New test.
