[Bug 267157] system reboots when date is set far in the future

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267157

            Bug ID: 267157
           Summary: system reboots when date is set far in the future
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: jschauma@netmeister.org

As noted in this thread:
https://lists.freebsd.org/archives/freebsd-hackers/2022-October/001550.html

FreeBSD/amd64 13.1R on at least AWS instances ami-0cf377776fddcf8ba
spontaneously reboot if the date is set to values larger than epoch
49282253052249598.

(On 13.0R / ami-00e91cb82b335d15f, this cut-off date appears to be epoch
44093078356492799.)

To reproduce:
Boot an instance of the given AMI above and log in as ec2-user.

$ su
# date -f "%s" 49282253052249598
Fri Dec 31 23:59:58 UTC 1561694399
# date -f "%s" 49282253052249599
Fri Dec 31 23:59:59 UTC 1561694399
[ reboots ~three seconds later ]

Rather than leading to a reboot, settimeofday(2) (I'm guessing) should return
EINVAL.

asomers@ noted that assertions in
https://github.com/freebsd/freebsd-src/commit/90a79ac5765a09d48b085183503324584ef0f956
could be added.

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