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2634261c17
If /var/lib/kubelet is MS_SHARED mountpoint, all the mountpoints under /var/lib/kubelet will have duplicate one. When `kubeadm reset -f` is executed, it will try to umount one path twice. However, they are in the peer group. Once we umount one path, the duplicate one will be umounted as well. So, in this case, we should ignore EINVAL error. Signed-off-by: Wei Fu <fuweid89@gmail.com>