What happened:

Use apiserver extension(APIService) RESTGracefulDeleteStrategy interface, impl its method CheckGracefulDelete to gracefully control resource deletion, when the field options.GracePeriodSeconds is nil, will lead to panic!!

What you expected to happen:

To first check if options.GracePeriodSeconds is nil, then get its value.

How to reproduce it (as minimally and precisely as possible):

Use apiserver extension(APIService) strategy, impl this function below will lead to panic:

// just impl this method and return true, then will lead to delete resource panic
func (s Strategy) CheckGracefulDelete(ctx context.Context, obj runtime.Object, options *metav1.DeleteOptions) bool {
	return true
}

Anything else we need to know?:

As the field DeleteOptions.GracePeriodSeconds is a int64 pointer, need to be careful when init the struct.

type DeleteOptions struct {
	GracePeriodSeconds *int64

Environment:

• Kubernetes version (use kubectl version): v1.21.0
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release): Linux
• Kernel (e.g. uname -a):
• Install tools:
• Network plugin and version (if this is a network-related bug):
• Others: