Comment 10 for bug 1918265

We are currently facing the same problems with Linux Virtual Machines running Ubuntu 18.04 and 20.04, both LTS releases.

Upon examining the Event Viewer on one of the Hosts machines, there's a critical error message:

Event ID: 18602
Source: Hyper-V-Worker

<VM_NAME> has encountered a fatal error and a memory dump has been generated. The guest operating system reported that it failed with the following error code: 0x1E. If the problem persists, contact Product Support for the guest operating system. (Virtual machine ID XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)

These are some fixes we have tried so far:
   - Install linux-azure packages and kernel;
   - Enable Secure boot on Guest Machine;
   - Scan the disk for corruption;
   - Try different kernels.

We couldn't try other fixes like Updating the Hyper-V Server to 2019 or disabling secure boot on Host machines, the reason being that we have around 200 VMs across 8 Hosts.

Current configuration:
   - 2 Clusters;
   - 4 Hosts per cluster;
   - All hosts are running Hyper-V 2016.

Unfortunately, we are not the only ones with the issue, the bug also affects Debian and RHEL distros:

https://access.redhat.com/solutions/4796261
https://docs.microsoft.com/en-us/answers/questions/530961/windows-server-2016-hyper-v-boot-error-w-virtual-s.html

These ones are the same:
https://docs.microsoft.com/en-us/answers/questions/52937/failure-to-boot-on-red-hat-enterprise-linux-rhel-o.html
https://social.technet.microsoft.com/Forums/en-US/1da1f987-52f0-4304-84f1-2c0ab52f3586/failure-to-boot-on-red-hat-enterprise-linux-rhel-or-centos-8-using-hyperv-2016?forum=linuxintegrationservices
https://social.technet.microsoft.com/Forums/en-US/3c48c962-a28d-44bb-bd80-5b7a902404d8/failure-to-boot-on-red-hat-enterprise-linux-rhel-or-centos-8-using-hyperv-2016?forum=winserverhyperv
https://www.reddit.com/r/HyperV/comments/hx2cps/failure_to_boot_on_red_hat_enterprise_linux_rhel/