NetworkManager segfaults on connect

[Ben Howard]

Upon connecting, NetworkManager from -updates is segfaulting:

[ 139.520739] NetworkManager[15884]: segfault at 0 ip 0000000000497ad7 sp 00007fff77195d00 error 4 in NetworkManager[400000+1bf000]

Nov 30 10:31:23 arbella NetworkManager[16259]: <info> keyfile: add connection in-memory (c4b6e184-67e3-4a12-8dd3-79ec7ef650e0,"enx803f5d087a34")
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (enx803f5d087a34): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20 41]
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (enx803f5d087a34): device state change: unavailable -> disconnected (reason 'connection-assumed') [20 30 41]
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (enx803f5d087a34): Activation: starting connection 'enx803f5d087a34' (c4b6e184-67e3-4a12-8dd3-79ec7ef650e0)
Nov 30 10:31:23 arbella NetworkManager[16259]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (lo): link connected
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (lo): new Generic device (carrier: ON, driver: 'unknown', ifindex: 1)
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (wlp2s0): using nl80211 for WiFi device control
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (wlp2s0): driver supports Access Point (AP) mode
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (wlp2s0): new 802.11 WiFi device (carrier: UNKNOWN, driver: 'ath10k_pci', ifindex: 3)
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (wlp2s0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Nov 30 10:31:23 arbella kernel: [ 140.168048] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> urfkill disappeared from the bus
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> use BlueZ version 5
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> wpa_supplicant running
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (wlp2s0): supplicant interface state: starting -> ready
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (lxcbr0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> (enx803f5d087a34): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Nov 30 10:31:23 arbella NetworkManager[16259]: <info> Policy set 'enx803f5d087a34' (enx803f5d087a34) as default for IPv4 routing and DNS.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: Network-Manager 1.0.4-0ubuntu5
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Nov 30 10:39:36 2015
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2015-11-21 (9 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
IpRoute:
 default via 10.20.64.1 dev wlp2s0 proto static metric 600
 10.0.3.0/24 dev lxcbr0 proto kernel scope link src 10.0.3.1
 10.20.64.0/21 dev wlp2s0 proto kernel scope link src 10.20.66.104 metric 600
 169.254.0.0/16 dev lxcbr0 scope link metric 1000
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 lxcbr0 bridge connected /org/freedesktop/NetworkManager/Devices/3 lxcbr0 ac91e68a-905e-4cd2-a937-11b8c5f4bed0 /org/freedesktop/NetworkManager/ActiveConnection/1
 wlp2s0 wifi connected /org/freedesktop/NetworkManager/Devices/2 Canonical-2.4GHz-g 4eb6b0d8-a49e-4e11-aff1-18ce3f158523 /org/freedesktop/NetworkManager/ActiveConnection/2
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

[Ben Howard (darkmuggle-deactivatedaccount)]

Downgrading (i.e. sudo apt-get -y --reinstall install --force-yes network-manager=1.0.4-0ubuntu5) and then rebooting fixed me.

[Maximilian (mkoegel)]

Same problem here. Downgrading does not fix the problem for me though...

[Sebastien Bacher (seb128)]

Thanks, when you say "from updates" is it 5.1 or 5.2 from proposed rather? Could you get a stacktrace of the segfault?

[Launchpad Janitor (janitor)]

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

[Vlad Firoiu (vladfi2)]

This just started happening to me after a update. According to apt-cache policy I have network-manager version 1.0.4-0ubuntu5.2 installed.

[Vlad Firoiu (vladfi2)]

This just started happening to me after a recent update. According to apt-cache policy I have network-manager version 1.0.4-0ubuntu5.2 installed.

[andrew.jeffery (andrew-aj)]

I ran into this issue. Looking at the code and the patches submitted upstream, it appears this commit should fix the issue:

http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=956577a24640cb96f6255417073d52230c573ed4

[Edward Z. Yang (ezyang)]

Confirmed downgrading fixes the problem.