Firstly, let me just say that I’ve recently encountered a disaster where a Windows Update wreaked havoc on a Hyper-V Core 2019 server. This update was intended to break compatibility with the set of CPUs that have known vulnerabilities to Spectre and Meltdown. However, we have protection against such threats using the Malwarebytes Cloud Endpoint on the Hyper-V host. Regardless, during a regular maintenance period a standard reboot was done and then this happened:
Luckily, this was restored from backups that we had.
The resolution was to re-install the Hyper-V 2019 Core and disable the automatic updates. We set it to “manual” for updates to prevent this issue in the future as we currently intend on using the TS430 for a little while despite its age.
If anyone else is having this issue wouldn’t it be nice if there was some type of pop-up before the reboot like “Are you sure you want to break the CPU compatibility by installing this update?”. At least for now manual updates is the current path for this instance and reviewing the necessary KB articles before updating.