kernel 3.13.0-4.19~precise1-generic: no internet via ethernet or WiFi

[volker kempter]

After booting no connection to the internet can be established, via cable or wifi. No such problem is found with 3.13.0-031300rc8-generic (mainline) nor with 3.11.0-16-generic (in both cases connection is established both via cable and wifi).

WORKAROUND: WiFi works replacing "quiet splash" by "apparmor=0" in /etc/default/grub .

---
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-4-generic.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: 92HD71B7X Analog [92HD71B7X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: volker 2256 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf6adc000 irq 47'
   Mixer name : 'Intel Cantiga HDMI'
   Components : 'HDA:111d76b2,1028024f,00100302 HDA:80862802,80860101,00100000'
   Controls : 32
   Simple ctrls : 11
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=89ca8c74-bcd6-475f-830d-2fba53d448bb
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. Latitude E6500
MarkForUpload: True
Package: linux (not installed)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 LANGUAGE=de:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-4-generic root=UUID=0724f90e-b0e4-48bf-a64d-c048acbfee33 ro apparmor=0
ProcVersionSignature: Ubuntu 3.13.0-4.19~precise1-generic 3.13.0-rc8
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-4-generic N/A
 linux-backports-modules-3.13.0-4-generic N/A
 linux-firmware 1.79.9
StagingDrivers: zram
Tags: precise running-unity staging precise running-unity staging
Uname: Linux 3.13.0-4-generic i686
UnreportableReason: Dies ist kein offizielles Ubuntu-Paket. Bitte entfernen Sie alle Pakete von Drittanbietern und wiederholen Sie den Vorgang.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout fuse lp lpadmin plugdev sambashare usb vboxusers video
dmi.bios.date: 12/18/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0NY667
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/18/2008:svnDellInc.:pnLatitudeE6500:pvr:rvnDellInc.:rn0NY667:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E6500
dmi.sys.vendor: Dell Inc.

[volker kempter (v-kempter)]

lspci -vvnn.log is empty, probably because I have no network connection

[Tim Gardner (timg-tpi)]

Add "apparmor=0" to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, then 'sudo update-grub'. It looks like dhclient is unable to run.

[Joseph Salisbury (jsalisbury)]

Hi Volker,

I can perform a kernel bisect to identify the commit that introduced this regression. Please test Tim's suggestion in comment #2 first, then we can bisect based on the results from that test.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1270215

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[volker kempter (v-kempter)]

@tim @joe

-> replacing "quiet splash" by "apparmor=0" in GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub (did not find quickly the syntax for "adding a option".....)
-> wifi works

volker
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________________________________________
Von: <email address hidden> [<email address hidden>] im Auftrag von Tim Gardner [<email address hidden>]
Gesendet: Freitag, 17. Januar 2014 18:09
An: Volker Kempter
Betreff: [Bug 1270215] Re: kernel 3.13.0-4.19~precise1-generic: no internet

Add "apparmor=0" to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub,
then 'sudo update-grub'. It looks like dhclient is unable to run.

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report.
https://bugs.launchpad.net/bugs/1270215

Title:
  kernel 3.13.0-4.19~precise1-generic: no internet

Status in “linux” package in Ubuntu:
  New
Status in “linux” source package in Precise:
  New

Bug description:
  kernel 3.13.0-4.19~precise1-generic under ubuntu-12.04 on dell e6500
  (i386):

  after booting with this kernel no connection to the internet can be established, neither by cable nor wifi.
  Same problem is found with lenovo T 412.

  No such problem is found with 3.13.0-031300rc8-generic (mainline) nor
  with 3.11.0-16-generic (in both cases connection is established both
  via cable and wifi).

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1270215/+subscriptions

[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

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[volker kempter (v-kempter)]

kernel 3.13.0-5.20 (linux-lts-saucy):

same problems as with 3.13.0-4.19 - no wifi
On the other hand, 3.13.0-031300 (mainline) works okay, including wifi.

Workaround for kernel 3.13.0-5.20 : WiFi works after adding "apparmor=0" in /etc/default/grub, doing "sudo update-grub" and rebooting.

volker

[volker kempter (v-kempter)]

kernel 3.13.0-4.19 and 3.13.0-5.20 (linux-lts-trusty) / no wifi:

in connection with the above problem: 3.11.0-17.30+precise1 does not produce any problems, in particular wifi works.
Test was made with the same system as for 3.13 (ubuntu 12.04 on dell e6500).

volker

[Pasi Tarhonen (pasi-tarhonen)]

I can confirm this bug. My computer M6600 works fin-lts-saucy with 3.11-lts-saucy and 3.13 mainline but network fails to connectfa with 3.13-lts-trustys.

[volker kempter (v-kempter)]

kernel 3.13.0-4.19 and 3.13.0-5.20 (linux-lts-trusty) / no wifi:

as a workaround, I can use 3.13.1-031301-generic from v3.13.1 (trusty) (mainline) which works in 12.04 (dell e6500), including wifi.

volker

[volker kempter (v-kempter)]

3.13.0-6-generic#23~precise2 on dell e6500:

wifi still works only when apparmor is de - activated (apparmor=0).
As mentioned above, the corresponding mainline kernel (3.13.1-031301-generic from v3.13.1 (trusty)) works including wifi.

volker

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-7.26

---------------
linux (3.13.0-7.26) trusty; urgency=low

  [ John Johansen ]

  * SAUCE: apparmor: fix uninitialized lsm_audit membe
    - LP: #1268727
  * Add config option to optionally enable new apparmor 3 semantics

  [ Tim Gardner ]

  * [Config] Add lowlatency to getabis
  * [Config] CONFIG_SECURITY_APPARMOR_AA3_SEMANTICS=y
    - LP: #1270215
  * Release Tracking Bug
    - LP: #1276810

  [ Upstream Kernel Changes ]

  * x86, x32: Correct invalid use of user timespec in the kernel
    - LP: #1274349
    - CVE-2014-0038
 -- Tim Gardner <email address hidden> Wed, 05 Feb 2014 15:49:44 -0500

[volker kempter (v-kempter)]

#32 This bug was fixed in the package linux - 3.13.0-7.26:

not fixed for me (dell e6500 under 12.04): still the same problem as with previous 3.13 kernel versions:
no wifi, but workaround apparmor=0 still works.

Most recent mainline kernel (3.13.1-031301-generic from v3.13.1 (trusty)) works, including wifi,

volker

[Tim Gardner (timg-tpi)]

Volker - can you attach a 3.13.0-7.26 kernel dmesg from the case when wifi isn't working ? Maybe Apparmor is blocking something else.

[volker kempter (v-kempter)]

#34
dmesg -which options?

[Tim Gardner (timg-tpi)]

Just 'dmesg > dmesg.txt', then attach dmesg.txt once you have rebooted to a configuration where your wifi works.

[volker kempter (v-kempter)]

#34 + 36

dmesg:
dmesg > dmesg.log for 12.04 under 3.13.0-7.26 (wifi not working)

volker

[volker kempter (v-kempter)]

3.13.0-8.27~precise1:

dell e6500 under 12.04: bug appears to be fixed -> wifi is working!
What was blocked by Apparmor!?

volker

[Andy Whitcroft (apw)]

To be clear, the issue here is that the trusty kernel implements mitigation of networking and the profiles in precise do not contain support for this. The patches applied allow the backport to be configured without this functionality.