From: Alexander Bluhm <bluhm@openbsd.org>
Subject: Re: Sysupgrade on i386 vmm to current snapshot hangs on boot into upgrade kernel
To: Brent Cook <busterb@gmail.com>
Cc: OpenBSD technical list <tech@openbsd.org>
Date: Thu, 26 Mar 2026 14:16:46 +0100

On Thu, Mar 26, 2026 at 12:42:41AM -0500, Brent Cook wrote:
> I was trying to sysupgrade -s a 7.8 VMM machine to a 7.9 snapshot, but the
> upgrade hangs on boot, and am not quite sure how to proceed.  Is this
> something that should work?
> 
> I can reset the machine and it comes back fine with the old kernel again.
> The host machine is already running a 6.9 snapshot from this week.

Running OpenBSD i386 as guest in vmm/vmd is quite broken.  Sometimes
it hangs durign boot soemwhere at "scsibus1 at softraid0: 256
targets".  But the hang happens not reliably, sometimes the machine
is runnig fine.  This makes tracking the bug down difficult.

We made some experiments with various versions of the host system
and the bug is present at least since OpenBSD 7.4.

bluhm