segfaulting

__attribute__((aligned(128)))
__constant char data[128];
kernel void test_as_type()
{
  char aligner[0x70];
  union { uint16 value; char raw[sizeof(uint16)]; } src;

  printf("data@ %x\n", data);
  printf("src@ %x\n", &src);
  printf("aligner@ %x\n", aligner);

  src.value = *((__constant uint16*)data);

  for (size_t i = 0; i < 16; ++i)
    printf("%d - %x \n", i, src.raw[i]);
}