OPNsense 25.1 DVD won't boot on Hyper-V Gen 2 (panic: page fault...)

[sits]

There seems to be a Problem with the OPNsense 25.1 Live-DVD on Hyper-V.
When I try to boot the Live-DVD it stops at "kdb_enter+0x33: movq $0,0xfd08d2(%rip)... (see more details on the screenshot below).

Steps to reproduce:

• Windows Server 2025
• New VM
• Generation 2
• 4GB RAM (fixed)
• 4 vCPU's
• 127 GB default VHDX
• Mount original "OPNsense-25.1-dvd-amd64.iso"
• Boot-Order: DVD first, VHD, Network
• Secure-Boot: Disabled

(Hint: The 24.7 ISO boots and installs flawless in the exact same VM.)

[franco]

Unionfs is used in the installer. If it's this bad in FreeBSD 14.2 that came with 25.1 then it's better to avoid it for now and install and upgrade from 24.7.

This may get fixed over there but they already said many years ago it's not supported while keeping it alive because there is not much else to use. ;)


Cheers,
Franco

[sits]

Thanks for responding Franco.

As workaround:
Installing 24.7 from the ISO and online-update "upgrade" to the latest 25.1-Release worked flawless.

Solution?
I don't know if (where) else I should report it other than here.
If I can contribute anything to a sustainable solution, please let me know.

[franco]

Since this is the first report I can recall it could be Hyper-V specific and may be even fixed with a Windows-side update (and/or came with one).

From QA experience I can assure you this doesn't happen for any hardware, but we're also not testing Hyper-V and generally recommend VMware because that has always been rock solid.


Cheers,
Franco