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#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) {
usleep(1000000);
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 1:
// CHECK: #0 free
// CHECK: #1 Thread1
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