腐败的Valgrind？

Question

我有以下简单程序：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <assert.h>
#include <errno.h>

#define handle_error_en(en, msg) \
    {do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0);}
#define status_check(stat) ((stat != 0) ? (handle_error_en(stat, "status error")) : ((void)0))

static void* thread_start(void *arg)
{
    printf("%s\n", "thread working..");
    sleep(1);
    return NULL;
}

int main(int argc, char const *argv[])
{
    int status;
    pthread_t thread;

    status = pthread_create(&thread,
                        NULL,
                        thread_start,
                        NULL);
    status_check(status);
    status = pthread_join(thread, NULL);
    status_check(status);
    printf("%s\n", "exit program..");
    return 0;
}

当我用

运行Valgind时

Valgrind --tool=helgrind ./threads_simple

我得到54个错误，都是数据争用错误。只选择其中一个：

Possible data race during write of size 4 at 0x1003FD2D8 by thread #1
==17334== Locks held: none
==17334==    at 0x1003E2FDF: spin_unlock (in /usr/lib/system/libsystem_platform.dylib)
==17334==    by 0x1003F7EAF: pthread_join (in /usr/lib/system/libsystem_pthread.dylib)
==17334==    by 0x100000E37: main (threads_simple.c:29)
==17334== 
==17334== This conflicts with a previous write of size 4 by thread #2
==17334== Locks held: none
==17334==    at 0x1003E2FDF: spin_unlock (in /usr/lib/system/libsystem_platform.dylib)
==17334==    by 0x1003F6FD6: _pthread_start (in /usr/lib/system/libsystem_pthread.dylib) 
==17334==    by 0x1003F43EC: thread_start (in /usr/lib/system/libsystem_pthread.dylib)
==17334==  Address 0x1003fd2d8 is in the Data segment of /usr/lib/system/libsystem_pthread.dylib

我写了更多小的线程程序，都给出了这样的错误。我的Valgrind安装是否已损坏？我通过brew安装在Mac上。