FreeBSD Gen2 VM in Azure Kernel Boot Stuck

Question

Hi,
I'm trying to deploy pfSense/OPNsense appliance (FreeBSD based) by creating gen2 VM on Hyper-V and then uploading vhd into Azure.
Created gen2 Azure VM uses custom storage account for boot diagnostics and serial console.

There is a problem with boot, it freezes after bootloader. (works fine with gen1 VM)
Sometimes it can boot after series of Reset-VM/NMI from serial console, works in 5-10% of cases.

There is something related to serial console output in FreeBSD and Azure COM emulator at the early boot time.
The issue is discussed in detail in the thread below.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264267

Answer 1

Hi there,

After you apply certain kernel changes (such as a kernel upgrade) to a Linux virtual machine (VM) on Azure, the VM can't restart. This article provides solutions to an issue in which a Linux virtual machine (VM) can't restart after applying kernel changes.

How to recover an Azure Linux virtual machine from kernel-related boot issues https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/kernel-related-boot-issues

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