[Bug 250755] 12.2-RELEASE i386 GENERIC kernel fails to load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250755

            Bug ID: 250755
           Summary: 12.2-RELEASE i386 GENERIC kernel fails to load
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: p5B2E9A8F at t-online.de

After trying to upgrade an 586 CPU system from 12.1-RELEASE to 12.2-RELEASE the
deployment via installkernel and installworld failed. 

Having read https://www.freebsd.org/releases/12.2R/relnotes.html I understood
that before FreeBSD-13.0 this system would not be affected and it is still the
same like in https://www.freebsd.org/releases/12.1R/relnotes.html

While other i366 systems could be upgraded without any problems from the same
buildworld/buildkernel run I got stuck on finding any changes/errors on the
build/deploy procedure here.

Finally I extracted the RELEASE-12.2 GENERIC kernel
kernel.txz     
d578b60e98b62f3f412068655f365a816e4c8fe9733ea45a9c6d14cb42ff64d4        899    
kernel  "Kernel (MANDATORY)"    on

on the system to exclude any potential local errors here.
Rebooting the 586 system resulted in a BTX halted. See screenshot attached.

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