1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
2 #include "test.h"
3 #include <sys/types.h>
4 #include <sys/stat.h>
5 #include <fcntl.h>
6 
7 // dup2(oldfd, newfd) races with close(newfd).
8 
9 int fd;
10 
11 void *Thread(void *x) {
12   barrier_wait(&barrier);
13   if (close(fd) == -1)
14     exit(printf("close failed\n"));
15   return 0;
16 }
17 
18 int main() {
19   barrier_init(&barrier, 2);
20   fd = open("/dev/random", O_RDONLY);
21   int fd2 = open("/dev/random", O_RDONLY);
22   if (fd == -1 || fd2 == -1)
23     exit(printf("open failed\n"));
24   pthread_t th;
25   pthread_create(&th, 0, Thread, 0);
26   if (dup2(fd2, fd) == -1)
27     exit(printf("dup2 failed\n"));
28   barrier_wait(&barrier);
29   pthread_join(th, 0);
30   fprintf(stderr, "DONE\n");
31 }
32 
33 // CHECK: WARNING: ThreadSanitizer: data race
34