On Wed, May 15, 2019 at 11:26:03AM +0200, Christophe Leroy wrote: > kobject_put() released index_dir->kobj Yes, but what is that kobject enclosed in? > but who will release 'index' ? The final kobject_put() will do that, see cacheinfo_create_index_dir() for the details. And please do not top-post, you lost all context. greg k-h