[Bug 293301] Kernel panic on tty switch

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293301

            Bug ID: 293301
           Summary: Kernel panic on tty switch
           Product: Base System
           Version: 15.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tembun@bk.ru

Created attachment 268194
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268194&action=edit
Textdump of a kernel panic

I'm running stable/15 with a custom kernel (config is attached) on ThinkPad
X220.
I have a kernel panic when I boot the machine, log into my user account, and
press Ctrl-Alt-2 in order to switch to another tty. Kernel panics immediately
after the tty is changed.
I tried that multiple times with different ttys and it happens every time,
though sometimes it may happen only after second or a third tty change.

Textdump is attached.

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