Re: Possible vmm/bhyve regression on FreeBSD 15

Hey,

On dg., des. 14 2025, Robert Ricci wrote:

> I've run into what appears to be a regression in vmm/bhyve in 
> FreeBSD 15, and could use some help tracking it down.
>
> I upgraded my AMD Zen 4 machine (via source) from stable/14 
> (sometime post-14.3) to stable/15 (currently running -stable 
> from today). I had some VMs (Linux guests of various flavors) 
> that were running fine before the update. After the update, they 
> won't start.
>
> The behavior is: the bootloader seems to work fine (eg. I can 
> run grub-bhyve, it runs to completion and exits). However once I 
> start bhyve itself, it just burns up a CPU (note: just one, no 
> matter how many vCPUs) - I get nothing on serial console, 
> nothing on the fbuf if I enable it.

I think I'm seeing this as well, did you manage to solve it?

For me it doesn't matter whether I use uefi or grub bootlaoders.

Here is my (suboptimal) temporary workaround:

- start a tmux
- run vm start -f VM-name on each tmux tab (somehow this works)

I also tried with vm-bhyve-devel-1.7.0_1 and have the same 
symptoms you mentioned.

Cheers,
-- 
Evilham