[Bug 1539634] [NEW] network-manager crashes when using libnl-3-200-3.21.1-1ubuntu1

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Ryan Harper (raharper):

[Triage Notes]

This regression is caused by a libnl proposed update tracked in bug
1511735. It has not been released as an update, only proposed as an
update for early testing. If you volunteered to test proposed updates,
then thank you. Your care and attention will stop this regression from
hitting ordinary users, and we appreciate your contribution to Ubuntu.

If you are not aware that you volunteered to test proposed updates, then
please be aware that your system is configured to do so. In this case,
you probably should turn this off. I'd appreciate if someone could
explain how to do this in the comments.

[Impact]

 * NetworkManager depends on libnl (libnl-3-200 libnl-genl-3-200
   libnl-route-3-200) and when libnl is updated to proposed
   3.2.21-1ubuntu1 NM segfaults due to libnl exposing a bug in NM
   validation packets.

   This affects the 0.98 release of NetworkManager and has already
   been fixed in newer releases.

 * Backporting fixes from upstream release is required to prevent
   NetworkManager from faulting which breaks networking on most
   Desktop releases.

 * All patches applied are already accepted upstream and newer Ubuntu
   releases are not affected.

 * Upgrading NetworkManager to 0.9.8.8-0ubuntu7.3 prior to updating
   libnl-3.2.21-1ubuntu1 is required to prevent NetworkManager crashing.

[Test Case]

 * Reproduce crash test:
    1. Download 14.04.03 Desktop iso, amd64
    2. Launched in a VM, run from iso
    3. In terminal, enable proposed
    4. sudo apt-get install libnl-3-200 libnl-genl-3-200 libnl-route-3-200
    5. sudo restart network-manager
    #  note the nm-applet disappears as NM has now crashed, no network
       conn.
    6. dmesg to confirm network-manager crash
    7. sudo dpkg --install gir1.2-networkmanager-1.0_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib4_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib-vpn1_0.9.8.8-0ubuntu7.3_amd64.deb libnm-util2_0.9.8.8-0ubuntu7.3_amd64.deb network-manager_0.9.8.8-0ubuntu7.3_amd64.deb
    8. sudo start network-manager
    #  nm-applet reappears, network connectivity restored

 * Successful upgrade test:
   1. Download 14.04.03 Desktop iso, amd64
   2. Launched in a VM, run from iso
   3. In a terminal, sudo dpkg --install gir1.2-networkmanager-1.0_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib4_0.9.8.8-0ubuntu7.3_amd64.deb libnm-glib-vpn1_0.9.8.8-0ubuntu7.3_amd64.deb libnm-util2_0.9.8.8-0ubuntu7.3_amd64.deb network-manager_0.9.8.8-0ubuntu7.3_amd64.deb
   4. sudo restart network-manager  # NM still runs, no crash, net up
   5. enable trusty-proposed in /etc/apt/sources.list
   6. sudo apt-get update
   7. sudo apt-get install libnl-3-200 libnl-genl-3-200 libnl-route-3-200
   8. sudo restart network-manager  # NM still runs, no crash, net up.

[Regression Potential]

 * NetworkManager is a highly visible package, so testing NetworkManager
   functionality is critical.  The patch does address the crash specificly
   introduced by the updated libnl SRU.

 * We need to ensure that users have installed this NetworkManager
   update before installing libnl3 update (special phasing needed).

[Original Description]
Testing out proposed libnl-3 package[1] exposed a bug in NM 0.98.

After installing updated libnl3 and restarting networkmanager, NM
crashes with:

/var/log/syslog shows:
init: network-manager main process (1057) killed by SEGV signal
init: network-manager main process ended, respawning
init: network-manager main process (1065) killed by SEGV signal
init: network-manager respawning too fast, stopped

The bug has been fixed in upstream 0.98 with these patches:

http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=8e4576b9fdb5c888d20a13aa2cc198df790dba54
http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=65981edb9f562c07e78815c98093da67c50bfdcf

** Affects: network-manager (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: network-manager (Ubuntu Trusty)
     Importance: High
         Status: Fix Committed


** Tags: regression-proposed verification-needed
-- 
network-manager crashes when using libnl-3-200-3.21.1-1ubuntu1
https://bugs.launchpad.net/bugs/1539634
You received this bug notification because you are a member of Ubuntu Sponsors Team, which is subscribed to the bug report.