Date: Tue, 23 Dec 2025 09:11:53 -0700 From: Robert Ricci <ricci@cs.utah.edu> To: Evilham <contact@evilham.com> Cc: <freebsd-virtualization@freebsd.org>, <virtualization@freebsd.org> Subject: Re: Possible vmm/bhyve regression on FreeBSD 15 Message-ID: <j66cvnq5zjl2gnaa6ogzrm4rvu42qxusy7fn54ajusspcucmdi@lominneza3rx> In-Reply-To: <a0d0eac391a6ba5f6b6b8f071f05d683122d@yggdrasil.evilham.com> References: <hasds5hof62ihqe2kzagcp652vmbvruabtf545sf77o574i6hq@porievfr5l2s> <a0d0eac391a6ba5f6b6b8f071f05d683122d@yggdrasil.evilham.com>
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I didn't manage to track it down myself, but others have found the cause
and a workaround, which you can follow at this ticket:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291768
On Tue, Dec 16, 2025 at 05:44:18PM +0100, Evilham wrote:
>
> 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
help
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