openafs-modules-dkms 1.8.4~pre1-1ubuntu2: openafs kernel module failed to build

Just happend after boot / login. /afs is now empty, restarting the openafs-client does not populate it.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: openafs-modules-dkms 1.8.4~pre1-1ubuntu2
ProcVersionSignature: Ubuntu 5.8.0-34.37~20.04.2-generic 5.8.18
Uname: Linux 5.8.0-34-generic x86_64
NonfreeKernelModules: socwatch2_11 vtsspp sep5 socperf3 pax
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
DKMSKernelVersion: 5.8.0-34-generic
Date: Thu Jan 7 06:45:14 2021
DuplicateSignature: dkms:openafs-modules-dkms:1.8.4~pre1-1ubuntu2:/var/lib/dkms/openafs/1.8.4pre1/build/src/afs/LINUX/osi_vfs.h:73:20: error: field ‘va_atime’ has incomplete type
InstallationDate: Installed on 2020-11-13 (55 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
PackageVersion: 1.8.4~pre1-1ubuntu2
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.2
SourcePackage: openafs
Title: openafs-modules-dkms 1.8.4~pre1-1ubuntu2: openafs kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)