[Bug 262856] kernel panic at boot time

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262856

            Bug ID: 262856
           Summary: kernel panic at boot time
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bsd@volki.at

A few days ago, I tried to upgrade from 12-STABLE to 13-STABLE but the new
kernel panicked instantly. Here's a transscript of the screen photo I made:

avail memory = 1552841136 (14889 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <ALASKA A M I>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 hardware threads
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address  = 0x28
fault code             = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff80396715
stack pointer          = 0x28:0xffffffff80e17f70
frame pointer          = 0x28:0xffffffff80e17f80
code segment           = base 0x0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags       = resume, IOPL = 0
current process        = 0 ()
trap number            = 12
panic: page fault
cpuid = 0
time = 1
Uptime: 1s

original photo:
http://www.volki.at/austausch/panic_2022-03/screenshot_panic.jpg
kernel: http://www.volki.at/austausch/panic_2022-03/kernel
kernel config: http://www.volki.at/austausch/panic_2022-03/CU08

Of course, I could try a GENERIC kernel and, if it works, change line by line
until the panic happens again, but this is a production system so I want to
avoid experiments as long as I don't know if they are necessary.

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