[Bug 260793] 'swapon -a' can crash the system

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260793

            Bug ID: 260793
           Summary: 'swapon -a' can crash the system
           Product: Base System
           Version: 12.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: pmc@citylink.dinoex.sub.org

Reproduce: 
----------
1. Have some early and late swapspaces configured and decently filled already.
2. With paging not yet exhausted, add another *late* swapspace into fstab.
3. Run "swapon -a".

This should not do anything, because the old swapspaces are already active, and
the new one is configured as "late", and a mere "swapon -a" would not activate
it.

Error:
------
kernel: pid 12296 (daemon), jid 5, uid 5100: exited on signal 10 (core dumped)
kernel: pid 17717 (ruby27), jid 5, uid 5100: exited on signal 6 (core dumped)
kernel: pid 14938 (daemon), jid 10, uid 5100: exited on signal 10 (core dumped)
kernel: pid 19184 (ruby27), jid 10, uid 5100: exited on signal 11 (core dumped)
kernel: pid 19182 (ruby27), jid 10, uid 5100: exited on signal 10 (core dumped)
[etc. etc. lots of them]

And subsequent kernel crash.
(It might appear that the processes coredumping are those that are fully
swapped out,  but this is unconfirmed).

I did not find time to analyze this in-depth; it happened twice, it is obvious
that 'swapon -a' does mangle something seriousely, so I just don't use it
anymore except during bringup.

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