[Bug 286103] panic: overlapping physical segments

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286103

            Bug ID: 286103
           Summary: panic: overlapping physical segments
           Product: Base System
           Version: 14.2-STABLE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: mi@FreeBSD.org

My VM running 14.2-PRERELEASE stable/14-n269305-089664a8db2e was quite stable
for months, but now portmgr have developed it obsolete and, in order to be able
to work with the latest ports, I attempted an upgrade to the latest 14.x -- the
stable/14-n271057-43933d89a325-dirty (the "dirty" is due solely to local
changes to the crypto/heimdal/lib/krb5/version-script.map).

The build was smooth, but upon reboot I started getting an endless
reboot-cycle. Capturing it into any sort of text-file proved impossible, so I'm
going to attach a video to this ticket.

The boot starts with an ominous (and unfortunate) warning about i386
architecture becoming deprecated, and then panics with "overlapping physical
segments".

The odd things about this setup:
 1. Kernel is based on the PAE config-file.
 2. The machine is a VM -- a guest on a Windows desktop running VirtualBox.
 3. Years ago I was getting strange out of memory errors, which only a reboot
could fix, once they started. Adding the following lines to loader.conf helped
back then -- and is still working with the earlier kernel.

  kern.ipc.nmbclusters=4096
  vm.kmem_size=134217728
  kern.maxswzone=4194304

I'm back to the older kernel for now, but would love to have this problem fixed
-- and for the original i386 architecture to have a long life.

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