kernel error message ifa_maintain_loopback_route: insertion failed for interface

[bringha]

Hello together,

after upgrade to 17.1.8 for what reasons ever, one of my interface is not accepting to get configured with a linkloca address:

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OPNsense opnsense: /usr/local/etc/rc.newwanipv6: The command '/sbin/ifconfig igb3 inet6 fe80::1:1%igb3' returned exit code '1', the output was 'ifconfig: ioctl (SIOCAIFADDR): File exists'
I have then the  following error messages in routing.log:

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Jun  7 20:28:26 OPNsense radvd[54605]: received icmpv6 RA packet with non-linklocal source address from 2003:46:e954:26f2:XXX:XXXX:XXXX:XXXX
Jun  7 20:28:26 OPNsense rtsold[88234]: <rtsol_input> invalid RA with non link-local source from 2003:46:e954:26f2:XXX:XXXX:XXXX:XXXX on igb3

and in dmesg

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ifa_maintain_loopback_route: insertion failed for interface igb3: 17

igb3 is one of my internal networks .... Mr. google is not really enlighting .....

What is the corrective measure to get rid of these messages? RA on all other internal interfaces works and they also get an link local address 

Thanks ...

br br