[Bug 253147] Setting for displaying utf8 characters on all vt consoles results in panic on 14-CURRENT and 13.0-ALPHA3

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253147

            Bug ID: 253147
           Summary: Setting for displaying utf8 characters on all vt
                    consoles results in panic on 14-CURRENT and
                    13.0-ALPHA3
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yasu at utahime.org

To display utf8 characters on all vt console I did following settings.

1. Download GNU Unifont BDF file
(http://unifoundry.com/pub/unifont/unifont-13.0.05/font-builds/unifont-13.0.05.bdf.gz)
2. gunzip unifont-13.0.05.bdf.gz
3. vtfontcvt unifont-13.0.05.bdf unifont.fnt
4. cp unifont.fnt /usr/share/vt/fonts
5. Add 'allscreens_flags="-f 8x16 unifont.fnt"' to /etc/rc.conf
6. Add 'hw.vga.textmode=0' to /boot/loader.conf.local
7. shutdown -r now

On 12.2-RELEASE and 11.4-RELEASE it works as is expected. But on
14-CURRENT(man) and 13.0-ALPHA3(stable/13) it result in kernel panic.

Screen shot of 14-CURRENT.
https://www.utahime.org/FreeBSD/panic.20210201.14-CURRENT.png

14-CURRENT(main):
yasu at rolling-vm-freebsd1[1006]% uname -a
FreeBSD rolling-vm-freebsd1.home.utahime.org 14.0-CURRENT FreeBSD 14.0-CURRENT
#0 main-n244517-f17fc5439f5: Mon Feb  1 10:55:51 JST 2021    
rootz at rolling-vm-freebsd1.home.utahime.org:/usr0/freebsd/src/obj/usr0/freebsd/src/git/amd64.amd64/sys/GENERIC
 amd64

13.0-ALPHA3(stable/13):
yasu at rolling-vm-freebsd5[1005]% uname -a
FreeBSD rolling-vm-freebsd5.home.utahime.org 13.0-ALPHA3 FreeBSD 13.0-ALPHA3 #0
stable/13-c256214-g40cb0344eb2: Mon Feb  1 11:30:28 JST 2021    
rootz at rolling-vm-freebsd5.home.utahime.org:/usr0/freebsd/src/obj/usr0/freebsd/src/git/amd64.amd64/sys/GENERIC
 amd64

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