[Bug 263362] Changing active boot environment hangs loader on serial console

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 17 Apr 2022 09:03:38 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263362

            Bug ID: 263362
           Summary: Changing active boot environment hangs loader on
                    serial console
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: thj@FreeBSD.org

Changing the active loader on a serial console hangs loader, a hard reset is
required to boot.

Entering and leaving the menu works, and selecting bootfs works, but selecting
the active BE hangs loader.

Loader works on vid console.

This happens both with any without multicons:

/boot/loader.conf:
#boot_multicons="YES"
#console="comconsole,vidconsole"
console="comconsole"
boot_serial="YES"
comconsole_speed="115200"

Install is from the 20220414 bf13db086b8-254817 snapshot, system is running
main-n254874-5fbf11f7039

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