iOS核心数据怎么会泄露?

NSMutableArray *e=[NSMutableArray  arrayWithArray:[[user videos] allObjects]];
    //the line above ^ is pointed to by leaks as generating a leak
for(VideoEntity * v in e)
{
    UploadThread *ut= [[UploadThread alloc] init];
    [ut setVideoEntity:v];
    [threads addObject:ut];
    [ut release];
}

其中user是一个托管对象,它包含VideoEntity作为一对多关系,我将VideoEntity分配给一些线程来操作……Leaks说VideoEntity正在泄漏。

有人有意见吗?