[Bug 1969901] [NEW] network-manager fails to renew ipv6 address

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Håkan Kvist (hakankvist):

[Impact]

 * Network manager might kill dhclient(6) and fail to start it again
   causing the IPv6 address to be lost on a network that uses mixed
   IPv4/IPV6.
   The network status will still be seen as online in gnome since ipv4
   is still active.
   The user then have to manually remove the dhcpv6 lease files and
   restart ipv6 connection/restart network manager to regain IPv6
   connectivity.

 * This is a cherry-pick from Network manager 1.10.8 (Ubuntu's version
   is based on 1.10.6):
   https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/7fbbe7ebee99785e38d39c37e515a64a28edef0f

 * Upstream bug:
   https://bugzilla.gnome.org/show_bug.cgi?id=783391

[Test Plan]

 * The exact conditions for reproducing this bug on mixed IPv4/IPv6
   networks are not known but includes using both IPv4 and IPv6,
   both using dhcp.

[Where problems could occur]

 * This patch could possibly break networking using and that would be bad.
   Network manager should be able to restart connection more properly with
   this patch though.

[Other Info]
 * We have tested this patch on a couple of clients where we have seen this
   this problem. If this patch is feasible to include in Ubuntu 18.04 we
   could request more users to test.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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network-manager fails to renew ipv6 address
https://bugs.launchpad.net/bugs/1969901
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