Christoph,

  static void nvme_free_ns(struct kref *kref)
  {
        struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
+ if (ns->head)
+               nvme_put_ns_head(ns->head);
+

When can we not have a ns-head set?

AFAICT, if nvme_alloc_ns succeeded, we have it set don't we?

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