1 // RUN: %clang_tsan -O1 %s -o %t
2 // RUN: %deflake %run %t | FileCheck %s --check-prefix=CHECK-NOZUPP
3 // RUN: %env_tsan_opts=suppressions='%s.supp':print_suppressions=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUPP
4 
5 #include "test.h"
6 
7 int *mem;
8 pthread_mutex_t mtx;
9 
Thread1(void * x)10 void *Thread1(void *x) {
11   pthread_mutex_lock(&mtx);
12   free(mem);
13   pthread_mutex_unlock(&mtx);
14   barrier_wait(&barrier);
15   return NULL;
16 }
17 
Thread2(void * x)18 void *Thread2(void *x) {
19   barrier_wait(&barrier);
20   pthread_mutex_lock(&mtx);
21   mem[0] = 42;
22   pthread_mutex_unlock(&mtx);
23   return NULL;
24 }
25 
main()26 int main() {
27   barrier_init(&barrier, 2);
28   mem = (int*)malloc(100);
29   pthread_mutex_init(&mtx, 0);
30   pthread_t t;
31   pthread_create(&t, NULL, Thread1, NULL);
32   Thread2(0);
33   pthread_join(t, NULL);
34   pthread_mutex_destroy(&mtx);
35   return 0;
36 }
37 
38 // CHECK-NOZUPP: WARNING: ThreadSanitizer: heap-use-after-free
39 // CHECK-NOZUPP:   Write of size 4 at {{.*}} by main thread{{.*}}:
40 // CHECK-NOZUPP:     #0 Thread2
41 // CHECK-NOZUPP:     #1 main
42 // CHECK-NOZUPP:   Previous write of size 8 at {{.*}} by thread T1{{.*}}:
43 // CHECK-NOZUPP:     #0 free
44 // CHECK-NOZUPP:     #{{(1|2)}} Thread1
45 // CHECK-NOZUPP: SUMMARY: ThreadSanitizer: heap-use-after-free{{.*}}Thread2
46 // CHECK-SUPP:   ThreadSanitizer: Matched 1 suppressions
47 // CHECK-SUPP:    1 race:^Thread2$
48