[Bug 299223] kqueue_fork:cponfork_timer_race test hangs forever with a single core

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299223

            Bug ID: 299223
           Summary: kqueue_fork:cponfork_timer_race test hangs forever
                    with a single core
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: brooks@FreeBSD.org

In trying to run the full test suite under qemu I've found that the
kqueue_fork:cponfork_timer_race test hangs reliably.  The system is still
running and somewhat responsive to input in that ^T works, but the text never
exits and won't did from ^C or suspend with ^Z.  Another shell via ssh simply
stops working.

When I ran the VM with -smp 2 the test succeeds, but I did notice
responsiveness of a second ssh session became quite laggy.

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