nm-connection-editor crashed with SIGSEGV in g_slist_length()

[Ricardo J. Moreira Teixeira]

After I login on Ubuntu (and this is a behaviour that started to appear since I installed 12.10 alpha 3) the network manager applet (although the system was already connected to my wi-fi) was only showing the last 4 entries of the normal menu (Enable networking, enable wireless, connection information and Edit connections). Usually it stays like that for 30 seconds or so and then shows all the other entries.
Because this time it was already taking 2 minutes, and I need to connect to a vpn, I disable the network through the applet and I got this error.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: network-manager-gnome 0.9.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
Uname: Linux 3.5.0-11-generic i686
ApportVersion: 2.5.1-0ubuntu2
Architecture: i386
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Fri Aug 24 19:20:43 2012
ExecutablePath: /usr/bin/nm-connection-editor
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120730.1)
IpRoute:
 default via 192.168.0.1 dev wlan0 proto static
 169.254.0.0/16 dev wlan0 scope link metric 1000
 192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.101 metric 9
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcCmdline: /usr/bin/nm-connection-editor
RfKill:
 0: hci0: Bluetooth
  Soft blocked: yes
  Hard blocked: no
SegvAnalysis:
 Segfault happened at: 0xb6dc4030 <g_slist_length+16>: mov 0x4(%edx),%edx
 PC (0xb6dc4030) ok
 source "0x4(%edx)" (0xaaaaaaae) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: network-manager-applet
Stacktrace:
 #0 0xb6dc4030 in g_slist_length () from /lib/i386-linux-gnu/libglib-2.0.so.0
 No symbol table info available.
 #1 0x08055af6 in _start ()
 No symbol table info available.
StacktraceTop:
 g_slist_length () from /lib/i386-linux-gnu/libglib-2.0.so.0
 _start ()
Title: nm-connection-editor crashed with SIGSEGV in g_slist_length()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors: (nm-connection-editor:2496): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `NMConnectionEditor'
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/1
 wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.6.0 connected enabled enabled enabled enabled enabled

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #778355, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.