Not a bug after all. I misconfigured network interfaces via .link files in /etc/systemd/network few weeks earlier but never did update-initramfs -u So all was fine till the kernel update which triggered that command and after reboot I noticed the problem. This bug report may be closed.
- Bug#910106: linux-image-4.9.0-8-amd64: Ethernet device ... Unknown
- Bug#910106: Not a bug after all. debstat...@sky.com