[Bug 286279] route ipv6 errors on bootup in 15.0-CURRENT when world/kernel built without INET6 support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286279

            Bug ID: 286279
           Summary: route ipv6 errors on bootup in 15.0-CURRENT when
                    world/kernel built without INET6 support
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: nxjoseph@protonmail.com

Hi,

I have upgraded my system from 14.2-REL to 15.0-CUR with WITHOUT_INET6 in
/etc/src.conf. In bootup, I see this output below.

route: message indicates error: File exists
add host 127.0.0.1: gateway lo0 fib 0: route already in table
route: bad keyword: inet6
route: usage: route [-j jail] [-46dnqtv] command [[modifiers] args]
route: bad keyword: inet6
route: usage: route [-j jail] [-46dnqtv] command [[modifiers] args]
route: bad keyword: inet6
route: usage: route [-j jail] [-46dnqtv] command [[modifiers] args]
route: bad keyword: inet6
route: usage: route [-j jail] [-46dnqtv] command [[modifiers] args]
route: bad keyword: inet6
route: usage: route [-j jail] [-46dnqtv] command [[modifiers] args]

There was a thread in mailing list that has temporary fix which is building the
kernel without ipv6 support completely.

Here is the mail:
https://lists.freebsd.org/archives/freebsd-current/2024-January/005287.html

I saw that there were no opened bugs about it and i created this now. I hope
this isn't a duplicate. Thanks in advance!

# uname -a
FreeBSD freebsd.home.arpa 15.0-CURRENT FreeBSD 15.0-CURRENT #0
main-n276625-d4763484f911: Mon Apr 21 18:00:43 +03 2025    
root@freebsd.home.arpa:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64

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