[Bug 270728] Clock stops, but system keeps running

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270728

            Bug ID: 270728
           Summary: Clock stops, but system keeps running
           Product: Base System
           Version: 12.4-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@thehugheslogcabin.net

I have 2 Dell PowerEdge C1100 systems running 12.4-RELEASE-p1 that the clock
will stop, but the system will keep running.  NTPD will stop because the time
gets too far behind.  The length of time that the clock stops running varies.

Since I update to 12.4, it took 7 days for it to happen.  Before updating to
12.4, it would happen randomly, anywhere from 1 hour to 12.

I'm running VirtualBox 6.1.26 on both, not sure if this has anything to do with
the problem.

The processor is an Intel Xeon L5520 2.27GHz. Both systems have 72G memory.

These systems were running an older version of FreeBSD and didn't have this
issue.

kern.eventtimer.timer: HPET
kern.eventtimer.choice: HPET(350) HPET1(340) HPET2(340) HPET3(340) LAPIC(100)
i8254(100) RTC(0)
kern.clockrate: { hz = 1000, tick = 1000, profhz = 8126, stathz = 127 }
kern.hz: 1000

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