Use RxSwift Driver cause memory leak - memory-leaks

Question

I write a demo about this leak.
import UIKit
import RxSwift
import RxCocoa
class ViewController: UIViewController {
private let viewModel = ViewModel()
private let disposeBag = DisposeBag()
private lazy var nameLabel: UILabel = {
let label = UILabel()
label.text = "idle"
return label
}()
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .white
self.view.addSubview(nameLabel)
nameLabel.frame = CGRect(x: 100, y: 100, width: 100, height: 30)
// not leak
viewModel.name.asObservable().bind(to: nameLabel.rx.text).disposed(by: disposeBag)
// leak
// viewModel.name.asDriver().drive(onNext: { [weak self] (name) in
// guard let weakSelf = self else { return }
// weakSelf.nameLabel.text = name
// }).disposed(by: disposeBag)
// leak
// viewModel.name.asDriver().drive(nameLabel.rx.text).disposed(by: disposeBag)
viewModel.name.accept("act")
}
}
class ViewModel {
let name: BehaviorRelay<String> = BehaviorRelay(value: "")
}
In Xcode Instrument Leaks, it will report leaks when using driver. But change to "bindTo", it works fine and no leaks report.
I change "driver.driveTo" to driver.drive(onNext), and handle recycle problem, still report leaks.
I'm really confused about this. And I wish someone can tell me why this happened, how can I fix it, or avoid this kind of leaks in the future.
Thanks.