dhcpcd-discuss

Hi Lucas

On 01/08/2020 16:42, Lucas Raab wrote:
> Hello,
>
> I'm receiving this error after upgrading from dhcpcd 9.0.2 to 9.1.4
> on OpenBSD-current. The result of which is that I no longer receive
> IPv6 addresses on any interfaces.
>
> dhcpcd_fork_cb truncated read 0 (expected 4)
> ps_ctl_listen: read: Undefined error: 0

Eek!
Looks like dhcpcd crashed :/
Is there any clue in dmesg?

Can you run in through `ktrace -d` and then email me off list the kdump output 
please?

> em0 is my external interface and em1 assigned to be the internal
> interface. I am using dhcpcd for IPv6-PD with rad providing a /64
> to my internal LAN.
>
> /etc/dhcpcd.conf:
> debug
>                                                                                 
> allowinterfaces em0
>                                                                                 
> # Allow users of this group to interact with dhcpcd via the control socket.
> controlgroup wheel
>                                                                                 
> # Inform the DHCP server of our hostname for DDNS.
> hostname
>                                                                                 
> # Use the hardware address of the interface for the Client ID.
> #clientid
> # or
> # Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
> # Some non-RFC compliant DHCP servers do not reply with this set.
> # In this case, comment out duid and enable clientid above.
> duid
>
> # Persist interface configuration when dhcpcd exits.
> persistent
>
> # Rapid commit support.
> # Safe to enable by default because it requires the equivalent option set
> # on the server to actually work.
> option rapid_commit
>
> # A list of options to request from the DHCP server.
> option domain_name_servers, domain_name, domain_search, host_name
> option classless_static_routes
> # Respect the network MTU. This is applied to DHCP routes.
> option interface_mtu
>
> # Most distributions have NTP support.
> #option ntp_servers
>
> # A ServerID is required by RFC2131.
> require dhcp_server_identifier
>
> # Generate SLAAC address using the Hardware Address of the interface
> #slaac hwaddr
> # OR generate Stable Private IPv6 Addresses based from the DUID
> slaac private
>
> ipv6only
> script ""
>
> interface em0
>          ia_na 0
>          ia_pd 1 em0/1 em1/2
>
> Using the default configuration file does yield an IPv6 address on
> em0. Looking at the differences between mine and the default,
> the PD config is the only obvious one.
>
> Let me know if additional information to properly troubleshoot is
> required

I'll try this on my OpenBSD-6.2 when I get the chance to see if I can re-produce it.

Are you passing any paramters to launch dhcpcd with from rc.conf?

Roy