** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux-lts-xenial (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: linux (Ubuntu Xenial)
Status: Confirmed => Triaged
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium
** No longer affects: linux-lts-xenial (Ubuntu)
** Tags added: kernel-da-key
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Medium
Status: Triaged
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Artful)
Status: New => Triaged
** Changed in: linux (Ubuntu Zesty)
Status: New => Triaged
** No longer affects: linux-lts-xenial (Ubuntu Xenial)
** Changed in: linux (Ubuntu Artful)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Zesty)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Artful)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Artful)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1738219
Title:
the kernel is blackholing IPv6 packets to linkdown nexthops
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Zesty:
In Progress
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
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.
Fixed in the upstream kernel with patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbfcd77631573ac4a9f57eb6169e04256a111bc1
I think this patch must be backported to stable kernel in Xenial. I
tested in patching the Ubuntu Xenial 4.4.0-21-generic and it works for
me.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1738219/+subscriptions
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