[Bug 254458] emulators/virtualbox-ose emulators/virtualbox-ose-additions guests do not respond properly if started from a snapshot that was saved whilst the guest ran

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254458

            Bug ID: 254458
           Summary: emulators/virtualbox-ose
                    emulators/virtualbox-ose-additions guests do not
                    respond properly if started from a snapshot that was
                    saved whilst the guest ran
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: grahamperrin at gmail.com
             Flags: maintainer-feedback?(vbox at FreeBSD.org)
          Assignee: vbox at FreeBSD.org

Created attachment 223470
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223470&action=edit
Screenshot, around thirteen minutes after attempting ACPI shutdown

FreeBSD 14.0-CURRENT host with virtualbox-ose 6.1.18. 

FreeBSD 13.0-RC3 guest with virtualbox-ose-additions 6.1.18. Other guests are
similarly affected, I'm not yet sure of the scope. 

If the guest runs (is not stopped) at the time of a snapshot, then after
starting from the snapshot: 

* there's no visible response to keyboard input

* in response to input from a Kensington Orbit Trackball, the on-screen pointer
moves as expected, window decorations and other aspects appear OK (twm)

* if I'm lucky, Control-F2 will switch to a tty however there's blackness, no
text, no visible response to keyboard input and Control-F9 might not switch
back to the window manager

* ACPI shutdown does not shutdown the machine, the screen shrinks and there
remains blackness with a rapidly blinking underline cursor at top left.

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