Ping and traceroute failing for eth0.3 on IPv6

This didn't seem promissing...

root@EdgeOpenWrt:/# ip -6 route get 1::
RTNETLINK answers: Permission denied
root@EdgeOpenWrt:/# ip -6 route get 1:: dev pppoe-wan
RTNETLINK answers: Permission denied
root@EdgeOpenWrt:/# ip -6 route get 1:: dev pppoe-wan from 2804:1b2:206:520:a9f2
:ca03:4dec:7c71
1:: from 2804:1b2:206:520:a9f2:ca03:4dec:7c71 via fe80::6b0:e7ff:fec9:4557 dev pppoe-wan proto static src 2804:1b2:206:520:a9f2:ca03:4dec:7c71 metric 512 pref medium
root@EdgeOpenWrt:/# ip -6 route get 1:: dev eth0.3
RTNETLINK answers: Permission denied
root@EdgeOpenWrt:/# ip -6 route get 1:: dev eth0.3 from 2804:14c:658b:1000:45d7:
3d14:cfdc:66cd
1:: from 2804:14c:658b:1000:45d7:3d14:cfdc:66cd via fe80::201:5cff:fe66:7646 dev eth0.3 proto static src 2804:14c:658b:1000:45d7:3d14:cfdc:66cd metric 512 pref medium
root@EdgeOpenWrt:/# ping6 -c 3 openwrt.org
PING openwrt.org (2a03:b0c0:3:d0::1af1:1): 56 data bytes
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=0 ttl=52 time=238.547 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=1 ttl=52 time=227.981 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=2 ttl=52 time=228.015 ms

--- openwrt.org ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 227.981/231.514/238.547 ms
root@EdgeOpenWrt:/# ping6 -c 3 -I 2804:1b2:206:520:a9f2:ca03:4dec:7c71 openwrt.o
rg
PING openwrt.org (2a03:b0c0:3:d0::1af1:1) from 2804:1b2:206:520:a9f2:ca03:4dec:7c71: 56 data bytes
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=0 ttl=52 time=231.257 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=1 ttl=52 time=230.968 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=2 ttl=52 time=231.466 ms

--- openwrt.org ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 230.968/231.230/231.466 ms
root@EdgeOpenWrt:/# ping6 -c 3 -I 2804:14c:658b:1000:45d7:3d14:cfdc:66cd openwrt
.org
PING openwrt.org (2a03:b0c0:3:d0::1af1:1) from 2804:14c:658b:1000:45d7:3d14:cfdc:66cd: 56 data bytes
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=0 ttl=46 time=232.976 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=1 ttl=46 time=235.716 ms
64 bytes from 2a03:b0c0:3:d0::1af1:1: seq=2 ttl=46 time=232.910 ms

--- openwrt.org ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 232.910/233.867/235.716 ms

Won't this route you suggested mess with mwan3? Now I remembered, it's reporting warnings with this interface too. Could you take a look before I add this route? Maybe it's the cause of this permission issue.

If this is caused by some problem on routing, I think permission denied is a misleading error message. It implies that root isn't permitted to run this command, not that it's a routing problem. Should I add a bug report suggesting a better message?