[Bug 234538] freebsd-update hangs on upgrade from 11.2p7 to 12.0 on Google Compute Engine

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234538

            Bug ID: 234538
           Summary: freebsd-update hangs on upgrade from 11.2p7 to 12.0 on
                    Google Compute Engine
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: morgan at vandagriff.org

freebsd-update fails to successfully upgrade a Google Compute Engine instance
running 11.2p7 to 12.0-RELEASE. Hangs on the second freebsd-update install step
after rebooting into the 12.0 kernel.

Replication steps using unmodified official image:

1.) Launch a Google Compute Engine instance using official 11.2 image:
freebsd-11-2-release-amd64 from the freebsd-org-cloud-dev project. Retain all
default instance settings. Note that, on first boot, the image successfully
updates itself to the latest patch level.
2.) Login to the instance using method of your choosing (serial console, SSH,
etc.)
3.) Run freebsd-update upgrade -r 12.0
4.) Run freebsd-update install
5.) Reboot as instructed
5.) Run freebsd-update install again
6.) Observe that the process hangs, with instance disk and CPU levels going to
idle after a moment or two.

Note that I also tried running the second freebsd-update install step without
first rebooting, to the same effect.

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