[Bug 264267] UEFI Booting on Azure Generation 2 VMs crashes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264267

            Bug ID: 264267
           Summary: UEFI Booting on Azure Generation 2 VMs crashes
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: mbaptist.opensource@gmail.com

I'm working on getting FreeBSD working on Microsoft Azure Gen 2 VM support and
hitting some issues. I have all of kib's latest relocatable kernel code he
committed in 13.1 (LA57 page table), and seem to have no UEFI booting issues on
KVM or other platforms.

Azure Gen 2 however crashes or stalls during SYSINIT and doesn't go to debugger
or anything. So far I can see it crashing during sysinit via printfs and am
rebuilding now with VERBOSE_SYSINIT=1 to see if I can identify a specific
sysinit module.

Hoping this bug makes it to right people, or someone can shoot me a few
pointers on what I could do to further debug this. I'm new to kernel
development in general, but have poked around on my system enough to understand
the basics of navigating the src tree and have taken some basic os classes so
hoping I can figure it out with some help if someone doesn't beat me to it.

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