| // RUN: %clang_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s |
| #include <pthread.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <stddef.h> |
| #include <unistd.h> |
| |
| int *mem; |
| pthread_mutex_t mtx; |
| |
| void *Thread1(void *x) { |
| pthread_mutex_lock(&mtx); |
| free(mem); |
| pthread_mutex_unlock(&mtx); |
| return NULL; |
| } |
| |
| void *Thread2(void *x) { |
| sleep(1); |
| pthread_mutex_lock(&mtx); |
| mem[0] = 42; |
| pthread_mutex_unlock(&mtx); |
| return NULL; |
| } |
| |
| int main() { |
| 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: WARNING: ThreadSanitizer: heap-use-after-free |
| // CHECK: Write of size 4 at {{.*}} by main thread{{.*}}: |
| // CHECK: #0 Thread2 |
| // CHECK: #1 main |
| // CHECK: Previous write of size 8 at {{.*}} by thread T1{{.*}}: |
| // CHECK: #0 free |
| // CHECK: #{{(1|2)}} Thread1 |
| // CHECK: SUMMARY: ThreadSanitizer: heap-use-after-free{{.*}}Thread2 |