USN-6152-1: Linux kernel (GKE) regression

Releases

• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• linux-gke - Linux kernel for Google Container Engine (GKE) systems

Details

It was discovered that NFS client's access cache implementation in the
Linux kernel caused a severe NFS performance degradation in certain
conditions. This updated makes the NFS file-access stale cache behavior
to be optional.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.04

• linux-image-gke - 5.15.0.1035.34
• linux-image-5.15.0-1035-gke - 5.15.0-1035.40
• linux-image-gke-5.15 - 5.15.0.1035.34

Ubuntu 20.04

• linux-image-5.4.0-1101-gke - 5.4.0-1101.108
• linux-image-gke - 5.4.0.1101.106
• linux-image-gke-5.4 - 5.4.0.1101.106

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• https://launchpad.net/bugs/2022098