[Bug 270460] i386 guest panic when booting VirtualBox client

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270460

            Bug ID: 270460
           Summary: i386 guest panic when booting VirtualBox client
           Product: Base System
           Version: CURRENT
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pjfloyd@wanadoo.fr

I have no problem booting other i386 versions in a VBox VM.
Host is amd64 running FreeBSD 13.1.

I don't remember when this first started, something like 6 months ago.

Because of this problem I am unable to do any testing of Valgrind on 14.0 i386. 

Here is the start of the panics from the VBox VM serial output.

smist: found supported isa bridge Intel PIIX4 ISA bridge
panic: td 0x1d94840 stack 0x2424ee8 not in kstack VA 0x2420000 4
cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self_wrapper(0,1d94840,4,2424000,9,...) at
db_trace_self_wrapper+0x28/frame 0x2424e9c
vpanic(1491c57,2424ed8,2424ed8,2424f9c,1415b35,...) at vpanic+0xf4/frame
0x2424eb8
panic(1491c57,1d94840,2424ee8,2420000,4,...) at panic+0x14/frame 0x2424ecc
trap(2424fa8,0,0,0,0,...) at trap+0x975/frame 0x2424f9c
calltrap() at 0xffc0321f/frame 0x2424f9c
--- trap 0x9, eip = 0xa02, esp = 0xffe, ebp = 0 ---
KDB: enter: panic
panic: td 0x1d94840 stack 0x2424d90 not in kstack VA 0x2420000 4
cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self_wrapper(0,1d94840,4,2424000,3,...) at
db_trace_self_wrapper+0x28/frame 0x2424d44
vpanic(1491c57,2424d80,2424d80,2424e48,1415b35,...) at vpanic+0xf4/frame
0x2424d60
panic(1491c57,1d94840,2424d90,2420000,4,...) at panic+0x14/frame 0x2424d74
trap(2424e54,8,28,28,100,...) at trap+0x975/frame 0x2424e48
calltrap() at 0xffc0321f/frame 0x2424e48
--- trap 0x3, eip = 0x1042444, esp = 0x2424e94, ebp = 0x2424e94 ---
kdb_enter(1527748,1527748) at kdb_enter+0x34/frame 0x2424e94
vpanic(1491c57,2424ed8,2424ed8,2424f9c,1415b35,...) at vpanic+0x11f/frame
0x2424eb8
panic(1491c57,1d94840,2424ee8,2420000,4,...) at panic+0x14/frame 0x2424ecc
trap(2424fa8,0,0,0,0,...) at trap+0x975/frame 0x2424f9c
calltrap() at 0xffc0321f/frame 0x2424f9c

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