dhcp6_listen: Address in use

[proukornew]

dhcpcd config (https://openwrt.org/packages/pkgdata/dhcpcd + v10.0.6):
interface some0
duid
noipv4
timeout 10
ipv6rs
ia_pd 1

netstat:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 :::546 :::* 19457/odhcp6c
udp 0 0 :::547 :::* 1823/odhcpd
udp 0 0 :::547 :::* 1823/odhcpd
udp 0 0 :::53 :::* 3542/unbound

log:
dhcpcd-10.0.6 starting
...
dhcp6_openudp: Address in use
dhcp6_start1: Address in use
...
some0: requesting DHCPv6 information
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor
some0: failed to request DHCPv6 information
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor
dhcp6_sendmessage: some0: sendmsg: Bad file descriptor

behavior:
trying to acquire unspecified address with silent log&non-use PD.
expected:
using ll-address for socket from specified interface.

[perkelix]

What version? What distro?

NOTE: odhcpd is not the same as dhcpcd.

[rsmarples]

Two different DHCP clients is never a good idea.

@proukornew you can solve this by starting dhcpcd on a specific interface like dhcpcd eth0, but this won't work in future dhcpcd versions.

You either want to use odhcpc or dhcpcd, not both :)

[proukornew]

netstat -unpl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
...
udp 0 0 fe80::1d10:7ff:fe1d:107:546 :::* 28829/dhclient

not a bug
client of healthy human vs narcoleptic client

[perkelix]

@proukornew dhclient is yet a third DHCP implementation. For obvious reasons, if you have so many DHCP clients installed on the same host, things are unlikely to work well.

[rsmarples]

And what's your point here? If you open dhcpcd in manager mode (which is the default with no interfaces listed and will be the only option in dhcpcd-11), it expects to open the dhcp client sockets on the unspecified address.

If it cannot do that, you get warned about it rather than sweeping errors under the table.
See #271 for why we will be going down this route.