Comment # 21 on bug 1092352 from Fabian Vogt

(In reply to Andrei Borzenkov from comment #19)
> I switched Leap 42.3 to NetworkManger instead of wicked and after reboot I
> got /etc/resolv.conf.netconfig and /etc/resolv.conf created directly by
> NetworkManager. In logs I have
[...]

Can you upload the zypp history logfile of the upgrade and the journal during
the upgrade? It might contain some hints.