rtadvctl -vv show : Segmentation fault

From: A FreeBSD User <freebsd_at_walstatt-de.de>
Date: Tue, 11 Feb 2025 21:42:12 UTC 
Hello,

I'm running a small 14-STABLE (FreeBSD 14.2-STABLE #11 n270324-8d5d7e2ba3a6: Thu Feb  6
16:56:03 CET 2025 amd64) based router appliance, running rtadvd(8).

When stoppimg/starting mpd5 several times, changing the IPv6 prefix, I can almost with a 100%
certainty reproduce such an error calling rtadvctl:

[...]
root@gate:~ # rtadvctl -vv show
igb0: flags=<UP,CONFIGURED,PERSIST> status=<RA_SEND> mtu 1500
        DefaultLifetime: 30m
        MinAdvInterval/MaxAdvInterval: 3m20s/10m
        AdvLinkMTU: <none>, Flags: <none>, Preference: medium
        ReachableTime: 0s, RetransTimer: 0s, CurHopLimit: 64
        AdvIfPrefixes: no
        Next RA send: Tue Feb 11 22:36:21 2025
        Last RA send: Tue Feb 11 22:30:23 2025
        Prefixes (1):
Segmentation fault
[...]

The indication of such a rtadvd failure within our network is no prefix delegation any
more, several IPv6 on the (client) hosts's NICs are marked "deprecated" or "detached", but
none usable.

Checking on the gateway with the command shown above results in a segmentation fault ... funny.

To solve this, we have to restart rtadvd.

-- 

A FreeBSD user