[Bug 213196] Upgrading Amazon EC2 instance from 10.3 to 11.0 results in hang at boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213196

            Bug ID: 213196
           Summary: Upgrading Amazon EC2 instance from 10.3 to 11.0
                    results in hang at boot
           Product: Base System
           Version: 11.0-RC1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: allanjude at FreeBSD.org

Peter Ankerstål on the -stable mailing list reports a failure to boot after
using freebsd-update to upgrade from 10.3-RELEASE to 11.0-RELEASE

https://lists.freebsd.org/pipermail/freebsd-stable/2016-October/085799.html

The issue is caused by EC2 hanging on an attempt to read past the end of the
disk


The issue was introduced in r297629 (6 months ago), but was not caught because
most installs are 4k aligned by the installer, and on most hardware, a read
past the end of the disk returns and error, which is silently ignored and
booting continues normally. For EC2, newer snapshots and images use a newer
disk layout that is 4k aligned, so avoided this issue. Only older instances
being upgraded to 11.0 encountered the problem.

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