1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2// Race between an aligned access and an unaligned access, which
3// touches the same memory region.
4#include "test.h"
5#include <stdint.h>
6
7uint64_t Global[2];
8
9void *Thread1(void *x) {
10  Global[1]++;
11  barrier_wait(&barrier);
12  return NULL;
13}
14
15void *Thread2(void *x) {
16  barrier_wait(&barrier);
17  char *p1 = reinterpret_cast<char *>(&Global[0]);
18  struct __attribute__((packed, aligned(1))) u_uint64_t { uint64_t val; };
19  u_uint64_t *p4 = reinterpret_cast<u_uint64_t *>(p1 + 1);
20  (*p4).val++;
21  return NULL;
22}
23
24int main() {
25  barrier_init(&barrier, 2);
26  pthread_t t[2];
27  pthread_create(&t[0], NULL, Thread1, NULL);
28  pthread_create(&t[1], NULL, Thread2, NULL);
29  pthread_join(t[0], NULL);
30  pthread_join(t[1], NULL);
31  printf("Pass\n");
32  // CHECK: ThreadSanitizer: data race
33  // CHECK: Pass
34  return 0;
35}
36