pthread_join всегда вызывает SIGSEGV

/* pthread.c */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define NUM_THREADS 4

void *BusyWork(void *t)
{
  int i;
  long tid;
  double result=0.0;
  tid = (long)t;
  printf("Thread %ld starting...\n",tid);
  for (i=0; i<1000000; i++)
  {
    result = result + sin(i) * tan(i);

  }
  printf("Thread %ld done. Result = %e\n",tid, result);
  pthread_exit((void*) t);

}

int main (int argc, char *argv[])
{
  pthread_t thread[NUM_THREADS];
  pthread_attr_t attr;
  int rc;
  long t;
  void *status;

  /* Initialize and set thread detached attribute */
  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

  for(t=0; t<NUM_THREADS; t++) {
    printf("Main: creating thread %ld\n", t);
    rc = pthread_create(&thread[t], &attr, BusyWork, (void *)t); 
    if (rc) {
      printf("ERROR; return code from pthread_create() is %d\n", rc);
      exit(-1);

    }

  }

  /* Free attribute and wait for the other threads */
  pthread_attr_destroy(&attr);
  for(t=0; t<NUM_THREADS; t++) {
    rc = pthread_join(thread[t], &status);
    if (rc) {
      printf("ERROR; return code from pthread_join() is %d\n", rc);
      exit(-1);

    }
    printf("Main: completed join with thread %ld having a status   of %ld\n",
        t,(long)status);

  }

  printf("Main: program completed. Exiting.\n");
  pthread_exit(NULL);
}

Бег

$ clang -g -o pthread pthread.c
$ valgrind --leak-check=full ./pthread

Выдает следующую ошибку valgrind:

==17283== Process terminating with default action of signal 11 (SIGSEGV)
==17283==  Access not within mapped region at address 0x700002F3CC3E
==17283==    at 0x10044437F: _pthread_find_thread (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100446D52: _pthread_join_cleanup (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100446C63: pthread_join (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100000D52: main (pthread.c:50)

Мой компьютер — Mac OS X (El Capitan). Для clang я использую Apple LLVM версии 7.0.2 (clang-700.1.81). Для Valgrind я использую valgrind-3.11.0.