unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Medium
|
Unassigned | ||
Saucy |
Fix Released
|
Medium
|
Unassigned |
Bug Description
When utah client is used to run floodlight smoke tests for saucy server images, the following error is reported.
May 17 17:41:13 ubuntu kernel: [ 618.483362] IPv6: ADDRCONF(
May 17 17:41:23 ubuntu kernel: [ 628.220062] unregister_
May 17 17:41:33 ubuntu kernel: [ 638.460029] unregister_
....
...
...
May 17 17:44:16 ubuntu kernel: [ 801.760026] unregister_
May 17 17:44:27 ubuntu kernel: [ 812.000029] unregister_
May 17 17:44:37 ubuntu kernel: [ 822.240031] unregister_
May 17 17:44:47 ubuntu kernel: [ 832.480024] unregister_
May 17 17:44:55 ubuntu kernel: [ 840.564053] INFO: task mnexec:9343 blocked for more than 120 seconds.
May 17 17:44:55 ubuntu kernel: [ 840.564268] "echo 0 > /proc/sys/
May 17 17:44:55 ubuntu kernel: [ 840.564494] mnexec D ffff88003fc14240 0 9343 8358 0x00000000
May 17 17:44:55 ubuntu kernel: [ 840.564498] ffff880036c3fe20 0000000000000046 ffff880036c3ffd8 0000000000014240
May 17 17:44:55 ubuntu kernel: [ 840.564501] ffff880036c3ffd8 0000000000014240 ffff88003c1add40 ffffffff81ccea60
May 17 17:44:55 ubuntu kernel: [ 840.564503] ffff88003c1add40 ffffffff81ccea64 00000000ffffffff ffffffff81ccea68
May 17 17:44:55 ubuntu kernel: [ 840.564506] Call Trace:
May 17 17:44:55 ubuntu kernel: [ 840.564531] [<ffffffff816d1
May 17 17:44:55 ubuntu kernel: [ 840.564535] [<ffffffff816cf
May 17 17:44:55 ubuntu kernel: [ 840.564550] [<ffffffff8117c
May 17 17:44:55 ubuntu kernel: [ 840.564554] [<ffffffff816ce
May 17 17:44:55 ubuntu kernel: [ 840.564564] [<ffffffff815c5
May 17 17:44:55 ubuntu kernel: [ 840.564574] [<ffffffff81081
May 17 17:44:55 ubuntu kernel: [ 840.564577] [<ffffffff81081
May 17 17:44:55 ubuntu kernel: [ 840.564582] [<ffffffff81057
May 17 17:44:55 ubuntu kernel: [ 840.564585] [<ffffffff816da
=======
This is observed to occur only when utah is used to run the floodlight smoke tests. Running the floodlight tests without utah does not cause this issue and using utah to run some other tests does not cause this issue either.
Noticed a similar bug 1021471, but this one is occurring in KVM using libvirt.
The issue is only with the saucy kernel versions, 3.9.0-1 onwards and does not occur with 3.9.0-0. The tests were tried with saucy server VMs on precise as well as saucy hosts and the results is the same.
================
Steps to reproduce:
1. Install a default saucy server on a vm (either manually or preseeded default installation) with either i386 or amd64 image using KVM, libvirt
2. Do the following to install utah inside the VM
sudo apt-add-repository -y ppa:utah/stable
sudo apt-get update
sudo apt-get install utah
3. Run the floodlight tests using
sudo utah -r lp:ubuntu-test-cases/server/runlists/floodlight.run
4. Now "kernel: [ 358.452029] unregister_
The impacted jobs are,
https:/
and
https:/
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-
ProcVersionSign
Uname: Linux 3.9.0-2-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.9.0-2-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.10.1-0ubuntu1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.
Date: Fri May 17 17:53:02 2013
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-05-17 (0 days ago)
InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Alpha amd64 (20130517)
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Bochs Bochs
MarkForUpload: True
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.108
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/01/2011
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias: dmi:bvnBochs:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs
tags: | added: iso-testing qa-daily-testing rls-r-incoming |
tags: |
added: rls-s-incoming removed: rls-r-incoming |
description: | updated |
tags: | added: performing-bisect |
tags: | removed: performing-bisect |
tags: | removed: kernel-key |
This change was made by a bot.