[Bug fortran/68927] New: Code aborts in deallocate statement with a stat= specified

["longb at cray dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68927

            Bug ID: 68927
           Summary: Code aborts in deallocate statement with a stat=
                    specified
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: longb at cray dot com
  Target Milestone: ---

> cat test.f90
program test
  use,intrinsic :: iso_c_binding
  real,target :: x(1000)
  real,pointer :: p (:)
  type(c_ptr) :: cp

  p => x
  cp = c_loc(p)
  call sub(cp)

end program test

subroutine sub(cp)
  use,intrinsic :: iso_c_binding
  real,pointer :: p(:)
  type(c_ptr) :: cp
  integer :: is

  call c_f_pointer(cp, p, [1000])
  deallocate (p, stat=is)
  print *, "deallocate status: ", is

end subroutine sub

> gfortran -v
Using built-in specs.
COLLECT_GCC=/opt/gcc/5.2.0/bin/../snos/bin/gfortran
COLLECT_LTO_WRAPPER=/opt/gcc/5.2.0/snos/libexec/gcc/x86_64-suse-linux/5.2.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../cray-gcc-5.2.0/configure --prefix=/opt/gcc/5.2.0/snos
--disable-nls --libdir=/opt/gcc/5.2.0/snos/lib --enable-languages=c,c++,fortran
--with-gxx-include-dir=/opt/gcc/5.2.0/snos/include/g++
--with-slibdir=/opt/gcc/5.2.0/snos/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit --build=x86_64-suse-linux --with-ppl --with-cloog
Thread model: posix
gcc version 5.2.0 20150716 (Cray Inc.) (GCC) 


> gfortran test.f90
> ./a.out
*** glibc detected *** ./a.out: munmap_chunk(): invalid pointer:
0x00007fff69364d90 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x79098)[0x7f5f922e7098]
./a.out[0x4009c6]
./a.out[0x400aab]
./a.out[0x400ae2]
/lib64/libc.so.6(__libc_start_main+0xe6)[0x7f5f9228cc36]
./a.out[0x4007b9]
======= Memory map: ========
[many lines of output deleted]