- kubeadm reset: unmount directories under `/var/lib/kubelet` for Linux only ([#81494](https://github.com/kubernetes/kubernetes/pull/81494), [@Klaven](https://github.com/Klaven))
- kubeadm: fix the bug that `--cri-socket` flag does not work for `kubeadm reset` ([#79498](https://github.com/kubernetes/kubernetes/pull/79498), [@SataQiu](https://github.com/SataQiu))

- kubeadm: when adding new control plane nodes with `kubeamd join`, ensure that the etcd member addition is performed only if a given member URL does not already exist in the list of members. Similarly, on "kubeadm reset" only remove an etcd member if its ID exists. ([#127491](https://github.com/kubernetes/kubernetes/pull/127491), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

- kubeadm: Added better handling of errors during unmount when calling `kubeadm reset`. When failing to unmount directories under `/var/run/kubelet`, kubeadm will now throw an error instead of showing a warning and continuing to clean up said directory. In such situations, it is better for you to inspect the problem and resolve it manually. Then, you can call `kubeadm reset` again to complete the cleanup.

      if (pos == limit) {
        // Empty path: keep the base path as-is.
        return
      }
      val c = input[pos]
      if (c == '/' || c == '\\') {
        // Absolute path: reset to the default "/".
        encodedPathSegments.clear()
        encodedPathSegments.add("")
        pos++
      } else {
        // Relative path: clear everything after the last '/'.

* kubeadm: reset: use crictl to reset containers ([#54721](https://github.com/kubernetes/kubernetes/pull/54721), [@runcom](https://github.com/runcom))

 *  Fix: Ensure canceled and discarded HTTP/2 data is not permanently counted against the limited
    flow control window. We had a few bugs where window size accounting was broken when streams
    were canceled or reset.
 *  Fix: Recover gracefully if the TLS session returns an unexpected version (`NONE`) or cipher
    suite (`SSL_NULL_WITH_NULL_NULL`).

		enc := json.NewEncoder(&buf)
		for {
			select {
			case <-ctx.Done():
				return
			case li := <-logCh:
				if !li.SendLog(node, logKind) {
					continue
				}
				buf.Reset()
				if err := enc.Encode(li); err != nil {
					continue
				}
				select {
				case <-ctx.Done():
					return
				case encodedCh <- append(grid.GetByteBuffer()[:0], buf.Bytes()...):
				}

    // If this succeeds, too many requests were made.
    executeSynchronously("/")
      .assertFailure(IOException::class.java)
      .assertFailureMatches(
        "stream was reset: CANCEL",
        "unexpected end of stream on " + server.url("/").redact(),
      )
  }

  @RetryingTest(5)
  @Flaky
  fun recoverWhenRetryOnConnectionFailureIsFalse_HTTP2() {

,n){var r;for(r=n<0?n+t:t<n?t:n;0<=--r;)e.push(r);return e}),gt:X(function(e,t,n){for(var r=n<0?n+t:n;++r<t;)e.push(r);return e})}}).pseudos.nth=b.pseudos.eq,{radio:!0,checkbox:!0,file:!0,password:!0,image:!0})b.pseudos[e]=B(e);for(e in{submit:!0,reset:!0})b.pseudos[e]=_(e);function G(){}function Y(e,t){var n,r,i,o,a,s,u,l=c[e+" "];if(l)return t?0:l.slice(0);a=e,s=[],u=b.preFilter;while(a){for(o in n&&!(r=y.exec(a))||(r&&(a=a.slice(r[0].length)||a),s.push(i=[])),n=!1,(r=m.exec(a))&&(n=r.shift(),...

- Kubeadm ensures "kubeadm reset" does not unmount the root "/var/lib/kubelet" directory if it is mounted by the user. ([#93702](https://github.com/kubernetes/kubernetes/pull/93702), [@thtanaka](https://github.com/thtanaka))