Looks like a fun crash ;)

Roland, would you be able to run NM in a debugger so that we can figure
out where it crashes?

Please see http://wiki.ubuntu.com/DebuggingProgramCrashes for how you
can do this; but you can also do so quickly by installing:

network-manager-dbg

And starting NM as so (after running 'sudo stop network-manager' to stop
it):

sudo gdb --args /usr/sbin/NetworkManager --no-daemon --log-level=debug

That will start NM with debug logs and in a debugger; once it crashes,
try to use the command 'bt full' to get a stacktrace of the failure.
Hopefully with this we'll have sufficient data despite missing other
debugging symbols.

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => High

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1025498

Title:
  network-manager segfaulting after bringing up Wi-Fi link

Status in “network-manager” package in Ubuntu:
  Incomplete

Bug description:
  On my system after updating today, I see network manager bring up my
  wifi link and then immediately start reconnecting.

  In my dmesg, I see many sequences of messages like

  [ 2027.559748] NetworkManager[7265]: segfault at 0 ip 00007f03d9939f7d sp 
00007fff1f62cbb0 error 4 in libc-2.15.so[7f03d9833000+1b3000]
  [ 2027.561881] init: network-manager main process (7265) killed by SEGV signal
  [ 2027.561942] init: network-manager main process ended, respawning

  my /var/log/apport.log shows

  ERROR: apport (pid 7120) Mon Jul 16 18:50:02 2012: called for pid 6970, 
signal 11, core limit 0
  ERROR: apport (pid 7120) Mon Jul 16 18:50:02 2012: executable: 
/usr/sbin/NetworkManager (command line "Network Manager")
  ERROR: apport (pid 7120) Mon Jul 16 18:50:02 2012: is_closing_session(): no 
DBUS_SESSION_BUS_ADDRESS in environment
  ERROR: apport (pid 7120) Mon Jul 16 18:50:02 2012: this executable already 
crashed 2 times, ignoring

  (I lost some reports because of course apport fails to upload while
  the network is down)

  Not sure what's going on, but I do note that there is a new network-
  manager version as of today.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: network-manager 0.9.6.0~git201207161259.00297f4-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
  Uname: Linux 3.5.0-4-generic x86_64
  ApportVersion: 2.3-0ubuntu4
  Architecture: amd64
  Date: Mon Jul 16 18:50:41 2012
  EcryptfsInUse: Yes
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120104)
  IpRoute:
   default via 10.1.0.1 dev wlan0  proto static 
   10.1.0.0/16 dev wlan0  proto kernel  scope link  src 10.1.0.198  metric 9 
   169.254.0.0/16 dev wlan0  scope link  metric 1000
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to quantal on 2012-06-30 (16 days ago)
  nmcli-con:
   Error: command ['nmcli', '-f', 'all', 'con'] failed with exit code 9: 
   ** (process:8260): WARNING **: Could not initialize NMClient 
/org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was 
not provided by any .service files
   Error: nmcli (0.9.5.95) 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:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN      
   not running     unknown    unknown         unknown       unknown         
unknown    unknown         unknown

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