add-neighbour-buggy.cl: error: possible read-write race on ((char*)A)[32]:

add-neighbour-buggy.cl:3:3: write by thread 8 group 0
  A[tid] += A[tid + offset];

add-neighbour-buggy.cl:3:3: read by thread 4 group 0
  A[tid] += A[tid + offset];