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