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      1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
      2 #include "test.h"
      3 
      4 void *Thread2(void *a) {
      5   barrier_wait(&barrier);
      6   *(int*)a = 43;
      7   return 0;
      8 }
      9 
     10 void *Thread(void *a) {
     11   int Var = 42;
     12   pthread_t t;
     13   pthread_create(&t, 0, Thread2, &Var);
     14   Var = 42;
     15   barrier_wait(&barrier);
     16   pthread_join(t, 0);
     17   return 0;
     18 }
     19 
     20 int main() {
     21   barrier_init(&barrier, 2);
     22   pthread_t t;
     23   pthread_create(&t, 0, Thread, 0);
     24   pthread_join(t, 0);
     25 }
     26 
     27 // CHECK: WARNING: ThreadSanitizer: data race
     28 // CHECK:   Location is stack of thread T1.
     29 
     30