On Thu, Oct 06, 2016 at 11:37:29PM +0100, Al Viro wrote: > If you ever get NULL in ->d_parent of struct dentry instance, you are > practically certain to have a dangling pointer to memory that used to > contain a struct dentry at some point but got freed and reused since then.
... which is what happens in your case, apparently. ->stats is still pointing to a dentry that had just been freed and its memory reused.
