Babeld "Interface lan4_17 has no link-local address" [was: Assorted error messages]

[ilario]

Just switch on an isolated router running the current code on OpenWrt 22.03 and observed some error messages in logread:

cron.err crond[...]: USER root pid ... cmd ((deferable-reboot &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((for dataFile in /var/shared-state/data/* ; do shared-state bleach $(basename $dataFile .json); done &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync babeld-hosts &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync bat-hosts &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync dnsmasq-hosts &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync dnsmasq-leases &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync dnsmasq-servers &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state sync nodes_and_links &> /dev/null)&)
cron.err crond[...]: USER root pid ... cmd ((sleep $(($RANDOM % 120)); shared-state-multiwriter sync network_nodes &> /dev/null)&)
cron.err crond[...]: time disparity of 133561 minutes detected
daemon.err babeld[...]: Interface eth0_17 has no link-local address.
daemon.err babeld[...]: Interface eth1_17 has no link-local address.
daemon.err babeld[...]: Warning: couldn't determine channel of interface eth0_17.
daemon.err babeld[...]: Warning: couldn't determine channel of interface eth1_17.
daemon.err babeld[...]: Warning: couldn't determine channel of interface wlan0-mesh_17.
daemon.err babeld[...]: Warning: couldn't determine channel of interface wlan1-mesh_17.
daemon.err babeld[...]: kernel_route(FLUSH): No such process
daemon.err babeld[...]: send: Address not available
daemon.err babeld[...]: setsockopt(IPV6_LEAVE_GROUP): Address not available
daemon.err dnsmasq[...]: cannot read /var/shared-state/dnsmasq_servers: No such file or directory
daemon.err watchping[...]: RTNETLINK answers: No such process

[ilario]

This is the logread on a YouHua WR1200JS running LibreMesh packages installed on OpenWrt 22.03:
http://sprunge.us/CvTVwP
(plenty of errors)

and this is another router of the same model with LibreMesh packages installed on OpenWrt 19.07:
http://sprunge.us/OmFOCv
(no error)

[ilario]

According to this comment, we have to consider that all the error messages coming from Busybox components, including cron, could be both errors or info:
https://forum.openwrt.org/t/cron-err-why/68655/6

[ilario]

But the Babeld errors seems real. The most abundant flooding of messages look like this:

daemon.err babeld[...]: Interface lan4_17 has no link-local address.
daemon.err babeld[...]: setsockopt(IPV6_LEAVE_GROUP): Address not available

[ilario]

But the Babeld errors seems real. The most abundant flooding of messages look like this:

daemon.err babeld[...]: Interface lan4_17 has no link-local address.
daemon.err babeld[...]: setsockopt(IPV6_LEAVE_GROUP): Address not available

For getting rid of these ones, we could manually assign link-local addresses like we add IPv4 addresses here:

lime-packages/packages/lime-proto-babeld/files/usr/lib/lua/lime/proto/babeld.lua

Lines 117 to 120 in 7664098

	uci:set("network", owrtInterfaceName, "proto", "static")
	uci:set("network", owrtInterfaceName, "ipaddr", ipv4:host():string())
	uci:set("network", owrtInterfaceName, "netmask", "255.255.255.255")
	uci:save("network")

@G10h4ck @spiccinini do you know if there is a better way?