With CSI the Kubernetes volume layer becomes truly extensible, allowing third party storage developers to write drivers making their storage systems available in Kubernetes without having to touch the core code.

CSI was first introduction as alpha in Kubernetes v1.9 and moved to beta in Kubernetes v1.10.

* Fix kube-controller-manager panic while provisioning Azure security group rules ([#64739](https://github.com/kubernetes/kubernetes/pull/64739), [@feiskyer](https://github.com/feiskyer))
* Fixes issue for readOnly subpath mounts for SELinux systems and when the volume mountPath already existed in the container image. ([#64351](https://github.com/kubernetes/kubernetes/pull/64351), [@msau42](https://github.com/msau42))

- Fixed using volume partitions on AWS Nitro systems. ([#100500](https://github.com/kubernetes/kubernetes/pull/100500), [@jsafrane](https://github.com/jsafrane)) [SIG Storage]

- Fixed a bug where containers would not start on cgroupv2 systems where swap is disabled. ([#120924](https://github.com/kubernetes/kubernetes/pull/120924), [@klueska](https://github.com/klueska)) [SIG Node]
- Fixed a regression in kube-proxy where it might refuse to start if given

- On compatible systems, a mounter's Unmount implementation is changed to not return an error when the specified target can be detected as not a mount point. On Linux, the behavior of detecting a mount point depends on `umount` command is validated when the mounter is created....

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