[Bug libgomp/81805] New: Another libgomp.c/for-5.c failure on nvptx -- illegal memory access

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81805

            Bug ID: 81805
           Summary: Another libgomp.c/for-5.c failure on nvptx -- illegal
                    memory access
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vries at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

Minimized from for-5.c, without simd:
...
extern void abort ();

#pragma omp declare target
int a[1500];
#pragma omp end declare target

__attribute__((noinline, noclone)) void
f2_tpf_static32 (void)
{
  unsigned long long i;
#pragma omp target parallel for schedule(static, 32)
  for (i = 0x7fffffffffffffffLL + 4500ULL - 27;
       i > 0x7fffffffffffffffLL - 27ULL; i -= 3)
    a[(i + 26LL - 0x7fffffffffffffffLL) / 3] -= 4;
}

__attribute__((noinline, noclone)) int
test_tpf_static32 (void)
{
  int i, j, k;
  for (i = 0; i < 1500; i++)
    a[i] = i - 25;

#pragma omp target update to(a)
  f2_tpf_static32 ();
#pragma omp target update from(a)

  for (i = 0; i < 1500; i++)
    if (a[i] != i - 29)
      return 1;

  return 0;
}

int
main ()
{
  if (test_tpf_static32 ())
    abort ();

  return 0;
}
...

...
$ ./install/bin/gcc -fopenmp -B$(pwd
-P)/install/offload-nvptx-none/libexec/gcc/x86_64-pc-linux-gnu/8.0.0 -B$(pwd
-P)/install/offload-nvptx-none/bin for-5.c -O2
$ ( export LD_LIBRARY_PATH=/usr/lib/nvidia-375:$(pwd -P)/install/lib64/;
./a.out ; echo $? )
libgomp: cuCtxSynchronize error: an illegal memory access was encountered

libgomp: cuMemFreeHost error: an illegal memory access was encountered

libgomp: device finalization failed
1
$ gcc for-5.c && ./a.out ; echo $?
0
...