Got fatal error: concurrent map writes when make run.

[wangcanfengxs]

log:

[steven-zou]

It seems the webhook registration does not support the concurrent register approach.

// Register marks the given webhook as being served at the given path.
// It panics if two hooks are registered on the same path.
func (s *Server) Register(path string, hook http.Handler) {
	s.defaultingOnce.Do(s.setDefaults)
	_, found := s.webhooks[path]
	if found {
		panic(fmt.Errorf("can't register duplicate path: %v", path))
	}
	// TODO(directxman12): call setfields if we've already started the server
	s.webhooks[path] = hook
	s.WebhookMux.Handle(path, instrumentedHook(path, hook))
	log.Info("registering webhook", "path", path)
}

panic here s.webhooks[path] = hook

the webhooks is just a common map:

// webhooks keep track of all registered webhooks for dependency injection,
	// and to provide better panic messages on duplicate webhook registration.
	webhooks map[string]http.Handler

[steven-zou]

Create an issue to the controller-runtime lib, check kubernetes-sigs/controller-runtime#1285

[steven-zou]

They fixed it in kubernetes-sigs/controller-runtime#1225 and fix contained in V0.6.4