1// Regression test for http://llvm.org/bugs/show_bug.cgi?id=21621
2// This test relies on timing between threads, so any failures will be flaky.
3// RUN: %clangxx_lsan %s -o %t
4// RUN: LSAN_OPTIONS="log_pointers=1:log_threads=1" %run %t
5#include <assert.h>
6#include <pthread.h>
7#include <stdio.h>
8#include <stdlib.h>
9
10pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
11pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
12bool flag = false;
13
14void *func(void *arg) {
15  // This mutex will never be grabbed.
16  fprintf(stderr, "entered func()\n");
17  pthread_mutex_lock(&mutex);
18  free(arg);
19  pthread_mutex_unlock(&mutex);
20  return 0;
21}
22
23void create_detached_thread() {
24  pthread_t thread_id;
25  pthread_attr_t attr;
26
27  pthread_attr_init(&attr);
28  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
29
30  void *arg = malloc(1337);
31  assert(arg);
32  // This mutex is never unlocked by the main thread.
33  pthread_mutex_lock(&mutex);
34  int res = pthread_create(&thread_id, &attr, func, arg);
35  assert(res == 0);
36}
37
38int main() {
39  create_detached_thread();
40}
41