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While running an Ubuntu kernel (not a mainline or third-party kernel)
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apport-collect 1806845

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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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  The unsigned vf->num_mac will be decreased to below zero and cause the
  VF port not working

Status in linux package in Ubuntu:

Bug description:
  The unsigned vf->num_mac in Ubuntu18.04.1 LTS i40e driver 2.1.14-k
  will be decreased to below zero when VF is trying to delete the MAC
  address which is added by PF and then add a new MAC address. And after
  this issue happens, VF won't be able to send/receive packets, and
  excepting for broadcast address, mac_filter_hash is empty in dumped
  VSI info.

  Ubuntu18.04.1 LTS kernel: 4.15.0-38-generic
  i40e driver: 2.1.14-k
  i40evf driver: 3.0.1-k

  Actual results:
  The unsigned vf->num_mac should decrease to below zero. The VF port doesn't 

  Expected results:
  The unsigned vf->num_mac range is from 0 to 65535;
  or the vf is not allowed to delete the MAC addr which is added by PF

  Corresponding Patch is required for resolving this i40e driver issue

  i40e: Prevent deleting MAC address from VF when set by PF

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