Quick fix AlmaLinux9 cloudInit kernel panic

Describe bug

Kernel panic:

• If you tried booting fresh cloudinit RHEL 9 install
• you tried upgrading rhel8->rhel9(almalinux 9, rocky 9…)

Cause

The problem may be that “El9” requires x86-64-v2 support and certain “CPUs” (modes in hypervisors) may not be able to compile with it.

Source

Fix

On hypervisor like Proxmox change CPU mode from kvm64 to host or any other that supports x86-64-v2 feature-set.

If you want to know more about CPU modes and performance changes between them.

Source