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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Confirmed

** Changed in: linux (Ubuntu Bionic)
     Assignee: Joseph Salisbury (jsalisbury) => (unassigned)

** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1738219

Title:
  the kernel is blackholing IPv6 packets to linkdown nexthops

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Confirmed

Bug description:
  == SRU Justification ==
  When the 'ignore_routes_with_linkdown' sysctl is set, we should not
  consider linkdown nexthops during route lookup.

  While the code correctly verifies that the initially selected route
  ('match') has a carrier, it does not perform the same check in the
  subsequent multipath selection, resulting in a potential packet loss.

  In case the chosen route does not have a carrier and the sysctl is set,
  choose the initially selected route.

  This is a regression introduced by commit 35103d11173b in 4.3-rc1.  Commit
  bbfcd7763 resolves this regression and is mainline as of 4.15-rc1.

  == Fix ==
  commit bbfcd77631573ac4a9f57eb6169e04256a111bc1
  Author: Ido Schimmel <idosch@xxxxxxxxxxxx>
  Date:   Tue Nov 21 09:50:12 2017 +0200

      ipv6: Do not consider linkdown nexthops during multipath

  == Regression Potential ==
  This fix is specific to ipv6 and fixes a current regression.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug reporter.
  The bug reporter states the test kernel resolved the bug.

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