NetworkManager crash when connecting to openvpn server

[Oscar Tiderman]

Trying to connect to VPN tunnel but everytime NetworkManager crashes:

May 2 08:49:48 hibbert NetworkManager[19055]: <error> [1430549388.372404] [platform/nm-linux-platform.c:2250] link_change(): Netlink error changing link 9: <DOWN> mtu 0 (1) driver 'unknown' udi '/sys/devices/virtual/net/tun0': No such device
May 2 08:49:48 hibbert NetworkManager[19055]: nm_device_get_priority: assertion 'NM_IS_DEVICE (dev)' failed
May 2 08:49:48 hibbert NetworkManager[19055]: (NetworkManager:19055): GLib-GObject-CRITICAL **: g_type_instance_get_private: assertion 'instance != NULL && instance->g_class != NULL' failed
May 2 08:49:48 hibbert kernel: [48747.430104] NetworkManager[19055]: segfault at 28 ip 0000000000477817 sp 00007ffd2a3a6c70 error 4 in NetworkManager[400000+10b000]
May 2 08:49:48 hibbert nm-openvpn[19584]: SIGTERM[hard,] received, process exiting
May 2 08:49:50 hibbert systemd[1]: NetworkManager.service: main process exited, code=dumped, status=11/SEGV
May 2 08:49:50 hibbert systemd[1]: Unit NetworkManager.service entered failed state.
May 2 08:49:50 hibbert systemd[1]: NetworkManager.service failed.
May 2 08:49:50 hibbert gnome-session[2255]: (nm-applet:2452): GLib-CRITICAL **: Source ID 18520 was not found when attempting to remove it

This exact configuration worked just fine before upgrading to Vivid

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: network-manager 0.9.10.0-4ubuntu15.1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sat May 2 08:52:22 2015
EcryptfsInUse: Yes
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2014-03-30 (397 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
IpRoute:
 default via 192.168.0.1 dev wlan0 proto static metric 1024
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.107
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to vivid on 2015-04-30 (1 days ago)
nmcli-con: Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 9: Error: nmcli (0.9.10.0) and NetworkManager (unknown) versions don't match. Force execution using --nocheck, but the results are unpredictable.
nmcli-dev: Error: command ['nmcli', '-f', 'all', 'dev'] failed with exit code 8: Error: NetworkManager is not running.
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

[Oscar Tiderman (oscar-tiderman)]

This only happens when IPv6 routes are pushed to the client, as soon as we removed the IPv6 routes I could connect without any issues again.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.