[Bug 268200] Upgrade from 12.3-RELESE to 12.4-RELEASE breaks remote ssh until next reboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268200

            Bug ID: 268200
           Summary: Upgrade from 12.3-RELESE to 12.4-RELEASE breaks remote
                    ssh until next reboot
           Product: Base System
           Version: 12.4-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: hk@alogis.com

I have a vanilla FreeBSD 12.3-RELEASE-p6 (amd64) system. Upgraded to
12.4-RELEASE as follows:

remote login via ssh
  freebsd-update upgrade -r 12.4-RELEASE
  freebsd-update install
  reboot
remote login via ssh
  freebsd-update install

now (after second install-run) remote login vi ssh is no longer possible

Current solution:
  whilst still logged on, reboot again

remote login via ssh is then possible again (at least when I tested this)

Originally tested with FreeBSD 12.3-RELEASE-p6 on VMWare Fusion (on MacBook Pro
with macOS Monterey 12.4), retested with a vanilla FreeBSD12.3-RELEASE install
(installed from ISO-Image FreeBSD-12.3-RELEASE-amd64-dvd1.iso), same problem.

This might bite all people who have remote systems without (remote) console
access.

Best regards
Holger

(not sure if this is similar to bug #41202)

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