- To enhance usability and developer experience, CRD validation rules now support direct use of (CEL) reserved keywords as field names in object validation expressions for existing expressions in storage, will fully support runtime in next release for compatibility concern. ([#126188](https://github.com/kubernetes/kubernetes/pull/126188), [@cici37](https://github.com/cici37)) [SIG API Machinery and Testing]

## Changelog since v1.18.19

## Changes by Kind

### Bug or Regression

- Reverted the previous fix for portforward cleanup because it introduced a kubelet regression which can lead into segmentation faults. ([#102838](https://github.com/kubernetes/kubernetes/pull/102838), [@saschagrunert](https://github.com/saschagrunert)) [SIG API Machinery and Node]

## Dependencies

### Added
_Nothing has changed._

* Fix issue in Portworx volume driver causing controller manager to crash ([#76341](https://github.com/kubernetes/kubernetes/pull/76341), [@harsh-px](https://github.com/harsh-px))
* Fixes segmentation fault issue with Protobuf library when log entries are deeply nested. ([#77224](https://github.com/kubernetes/kubernetes/pull/77224), [@qingling128](https://github.com/qingling128))

- Fixed attaching volumes after detach errors. Now volumes that failed to detach are not treated as attached, Kubernetes will make sure they are fully attached before they can be used by pods. ([#120595](https://github.com/kubernetes/kubernetes/pull/120595), [@jsafrane](https://github.com/jsafrane)) [SIG Apps and Storage]

* fix smb unmount issue on Windows ([#75087](https://github.com/kubernetes/kubernetes/pull/75087), [@andyzhangx](https://github.com/andyzhangx))
* Fixes segmentation fault issue with Protobuf library when log entries are deeply nested. ([#77224](https://github.com/kubernetes/kubernetes/pull/77224), [@qingling128](https://github.com/qingling128))

<pre class="ebnf">
MapType     = "map" "[" KeyType "]" ElementType .
KeyType     = Type .
</pre>

<p>
The <a href="#Comparison_operators">comparison operators</a>
<code>==</code> and <code>!=</code> must be fully defined
for operands of the key type; thus the key type must not be a function, map, or
slice.
If the key type is an interface type, these
comparison operators must be defined for the dynamic key values;

pkg syscall (freebsd-arm64), const EDOOFUS = 88
pkg syscall (freebsd-arm64), const EDOOFUS Errno
pkg syscall (freebsd-arm64), const EDQUOT = 69
pkg syscall (freebsd-arm64), const EEXIST = 17
pkg syscall (freebsd-arm64), const EFAULT = 14
pkg syscall (freebsd-arm64), const EFBIG = 27
pkg syscall (freebsd-arm64), const EFTYPE = 79
pkg syscall (freebsd-arm64), const EFTYPE Errno
pkg syscall (freebsd-arm64), const EHOSTDOWN = 64

pkg syscall (darwin-arm64), const EDEVERR Errno
pkg syscall (darwin-arm64), const EDOM = 33
pkg syscall (darwin-arm64), const EDQUOT = 69
pkg syscall (darwin-arm64), const EEXIST = 17
pkg syscall (darwin-arm64), const EFAULT = 14
pkg syscall (darwin-arm64), const EFBIG = 27
pkg syscall (darwin-arm64), const EFTYPE = 79
pkg syscall (darwin-arm64), const EFTYPE Errno
pkg syscall (darwin-arm64), const EHOSTDOWN = 64

pkg syscall (netbsd-arm64-cgo), const EDOM = 33
pkg syscall (netbsd-arm64-cgo), const EDQUOT = 69
pkg syscall (netbsd-arm64-cgo), const EEXIST = 17
pkg syscall (netbsd-arm64-cgo), const EFAULT = 14
pkg syscall (netbsd-arm64-cgo), const EFBIG = 27
pkg syscall (netbsd-arm64-cgo), const EFTYPE = 79
pkg syscall (netbsd-arm64-cgo), const EFTYPE Errno
pkg syscall (netbsd-arm64-cgo), const EHOSTDOWN = 64

- Reverted the previous fix for portforward cleanup because it introduced a kubelet regression which can lead into segmentation faults. ([#102588](https://github.com/kubernetes/kubernetes/pull/102588), [@saschagrunert](https://github.com/saschagrunert)) [SIG API Machinery and Node]

### Other (Cleanup or Flake)