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Date:      Thu, 20 Mar 2025 18:41:58 +0100
From:      A FreeBSD User <freebsd@walstatt-de.de>
To:        FreeBSD CURRENT <freebsd-current@freebsd.org>
Cc:        freebsd-net@freebsd.org
Subject:   rtadvd: rtadvctl -vv show : Segmentation fault - after lots of Link up and downs (ISP)
Message-ID:  <20250320184143.72723d05@thor.sb211.local>

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[-- Attachment #1 --]
Hello,

when there are often changes of the IPv6 prefix and rtadvd is running, the command

rtadvctl -vv show

quits with a "Segmentation fault error" after the first vlan interface shown, not showing any
subsequent vlan NIC. Prefix delegation is corrupted and so the IPv6 network behind the router.
I have to restart rtadvd to mitigate this problem.

I run an PCengine APU2 with three physical NICs, the interior NIC has up to 10 vlan
configured.

The problem can easily be reproduced by restarting mpd5 several times (I was configuring and
coding a link-up script and had to restart mpd5 2-3 times a minute over an hour or so).

Without the restart of rtadvd, the service remains dead and inoperative.

The APU2 is running FreeBSD 14-STABLE:
FreeBSD 14.2-STABLE #23 n270736-94f414086075: Tue Mar 11 20:52:07 CET 2025

Kind regards,
oh
 



-- 

A FreeBSD user

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