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'kubeadm reset' uses incorrect way of unmounting /var/lib/kubelet directories. It queries /proc/mounts for /var/lib/kubelet mount point. If /var/lib/kubelet directory is also mounted it makes 'kubelet reset' to unmount it too, which is incorrect. It also makes it fail as it can't unmount /var/lib/kubelet before unmounting mounts inside it. Fixed by querying /var/lib/kubelet/ instead of /var/lib/kubelet. This should exclude /var/lib/kubelet from the query results even if it's mounted. Fixes: kubernetes/kubeadm#1294