[Bug 231430] 'Fatal trap 9: general protection fault while in kernel mode' when rebooting after installkernel on VirtualBox VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231430

            Bug ID: 231430
           Summary: 'Fatal trap 9: general protection fault while in
                    kernel mode' when rebooting after installkernel on
                    VirtualBox VM
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yasu at utahime.org

Created attachment 197171
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=197171&action=edit
Screenshot when updating from ALPHA3 to ALPHA4

I'm tracking head with VirtualBox VM. Every time new snapshot is released I
update to same revision. So buildworld, buildkernel and installkernel always
complete sucsessfully. But when rebooting system always crashes with 'Fatal
trap 9: general protection fault while in kernel mode' message. And if I closed
VM window and restart VM, new kernel start up without any problem.

Attached PNG file is a screenshot when updating from ALPHA3 to ALPHA4.

Conditions about VM and host are following:

VM:
  CPU: x4
  Memory: 8GB
  Disk: 100GB SATA
Host:
  CPU: Intel Core i7 4770S
  Memory: 16GB
  Disk: 2TB SATA
  OS: 64bit Windows 10 Enterprise 1803
  VirualBox: 5.2.18

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