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[Pauli <1507062@xxxxxxxxxxxxxxxxxx>]

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/1507062

Title:
  After suspend resume network manager fails to set default route entry
  to routing table for mobile broadband connection

Status in network-manager package in Ubuntu:
  New

Bug description:
  This is regression from 10.04.

  It seems to reproduce often but not always which might point to some
  kind of race condition handled badly.

  Basic setup:
  * Huawei USB 3G modem
  * Network manager set to auto connect with saved pin
  * Laptop which has very few suspend-resume issues so I use suspending all the time

  I noticed the bug that modem led and network manager indicated that
  there was a connection. But connection didn't seems to work.

  My initial workaround in hurry was just to pull the modem from laptop
  and restart both modem manager and network manager. (they don't like
  modem unplugging or individual restarts but those are long standing
  separated bugs that I haven't cared to report) After restarting
  connection comes up working.

  I decided to investigate what is broken after resume and I could
  narrow issue to be that default route is missing from routing table.
  That resulted to very simple fix where I can simple manually add the
  missing default route.

  Broken table after suspend:

  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  link-local      *               255.255.0.0     U     1000   0        0 ppp0
  rantapallo      *               255.255.255.255 UH    750    0        0 ppp0

  Working table before suspend:
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  default         *               0.0.0.0         U     750    0        0 ppp0
  link-local      *               255.255.0.0     U     1000   0        0 ppp0
  rantapallo      *               255.255.255.255 UH    750    0        0 ppp0

  
  Command to add the missing route manually:

  sudo route add default netmask 0.0.0.0  metric 750 dev ppp0

  
  That is at least so far only missing part of connection setup after suspend. I will report a separate bug if I see a different error causing similar reconnecting failure after suspend-resume.

  apport should include syslog with detailed log from suspend-resume and
  service restarts to get correct route tables.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: network-manager 1.0.4-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-15.18-generic 4.2.3
  Uname: Linux 4.2.0-15-generic x86_64
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sat Oct 17 03:19:00 2015
  InstallationDate: Installed on 2011-11-02 (1444 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  IpRoute:
   default dev ppp0  scope link  metric 750 
   169.254.0.0/16 dev ppp0  scope link  metric 1000 
   176.93.96.110 dev ppp0  proto kernel  scope link  src 176.93.96.110  metric 750
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to wily on 2015-10-10 (6 days ago)
  nmcli-dev:
   DEVICE   TYPE      STATE        DBUS-PATH                                  CONNECTION        CON-UUID                              CON-PATH                                           
   ttyUSB0  gsm       connected    /org/freedesktop/NetworkManager/Devices/3  Dna dna internet  17b039cf-5b74-42af-af9a-d84c2519b250  /org/freedesktop/NetworkManager/ActiveConnection/1 
   eth0     ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/0  --                --                                    --                                                 
   wlan0    wifi      unavailable  /org/freedesktop/NetworkManager/Devices/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'.

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