[Bug 265549] Vultr Q35 hangs while booting during virtio-random initialization

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265549

            Bug ID: 265549
           Summary: Vultr Q35 hangs while booting during virtio-random
                    initialization
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bgfbsd@foob.us

Created attachment 235596
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=235596&action=edit
FreeBSD 13.1 Installer hang at virtio-random

Vultr QEMU Q35 hangs while booting during virtio-random initialization on
FreeBSD-13.1-RELEASE and FreeBSD-14.0-CURRENT.

Vultr engineering has temporarily worked around it by blacklisting
virtio-random on their FreeBSD images  and/or falling back to i440fx
virtualization.  This requires that users installing FreeBSD from their own
known media have to do one of the following:

* modify their ISO to blacklist virtio-random 
* do the kludge of installing a Vultr FreeBSD image (which defaults to i440fx
emulation) and then reinstalling via an attached ISO image.  
* setting 'hint.vtrnd.0.disabled=1’ at the loader prompt and booting.

To quickly spin up a VM I use a raw image from the FreeBSD images -- customized
with pre-loaded configuration -- but it has the exact same hang unless I modify
it to blacklist virtio-random.  

This bug comment has information from Vultr engineering corroborating the
issue.

bug #254513, comment #c32

I’ve attached images of the FreeBSD-13.1 RELEASE via the VNC console, first
from the boot installer hang and subsequently from single user with a
subsequent kldload virtio-random which causes an immediate hang.  Apologize for
the images but the Vultr console doesn’t allow cut and paste of the screen.

Please let me know if I can provide any other information.

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