Re: rtadvctl -vv show : Segmentation fault

> On Feb 12, 2025, at 5:42 AM, A FreeBSD User <freebsd@walstatt-de.de> wrote:
> 
> 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.

Do you get the core dump ? You can attach the core to gdb or lldb to easily figure out which
line of source code is to be blamed.

> 
> To solve this, we have to restart rtadvd.
> 
> --
> 
> A FreeBSD user