We have seen the issue only when deploying Xenial, installations running Precise or Trusty do not seem to be affected.
Running with 4.6.0-040600rc6-generic has shown the same behaviour. After doing the rmmod/modprobe cycle, I have now found the attached set of messages in the output of "journalctl -x", so this seems to confirm my suspicion of some bad interaction between kernel and systemd going on. ** Attachment added: "Output of "journalctl -x" when doing "rmmod igb;sleep 3;modprobe igb"" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1578141/+attachment/4657073/+files/journal.txt ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Also affects: systemd (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1578141 Title: Predictable interface names partially broken with igb driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1578141/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
