This bug does not exist any more. Sorry for the delayed response. I'll
mark it as Fix Released. Thanks for the time on this.
** Changed in: linux (Ubuntu Saucy)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1181315
Title:
unregister_netdevice: waiting for lo to become free. Usage count = 2'
is reported and causing kernel hang when floodlight tests are run
using utah
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Saucy:
Fix Released
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(NETDEV_UP):
s1-eth1: link is not ready
May 17 17:41:23 ubuntu kernel: [ 628.220062] unregister_netdevice: waiting
for lo to become free. Usage count = 2
May 17 17:41:33 ubuntu kernel: [ 638.460029] unregister_netdevice: waiting
for lo to become free. Usage count = 2
....
...
...
May 17 17:44:16 ubuntu kernel: [ 801.760026] unregister_netdevice: waiting
for lo to become free. Usage count = 2
May 17 17:44:27 ubuntu kernel: [ 812.000029] unregister_netdevice: waiting
for lo to become free. Usage count = 2
May 17 17:44:37 ubuntu kernel: [ 822.240031] unregister_netdevice: waiting
for lo to become free. Usage count = 2
May 17 17:44:47 ubuntu kernel: [ 832.480024] unregister_netdevice: waiting
for lo to become free. Usage count = 2
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/kernel/hung_task_timeout_secs" disables this message.
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] [<ffffffff816d1499>]
schedule_preempt_disabled+0x29/0x70
May 17 17:44:55 ubuntu kernel: [ 840.564535] [<ffffffff816cf537>]
__mutex_lock_slowpath+0xe7/0x160
May 17 17:44:55 ubuntu kernel: [ 840.564550] [<ffffffff8117cbcf>] ?
__kmalloc+0x14f/0x180
May 17 17:44:55 ubuntu kernel: [ 840.564554] [<ffffffff816cefbf>]
mutex_lock+0x1f/0x30
May 17 17:44:55 ubuntu kernel: [ 840.564564] [<ffffffff815c5e05>]
copy_net_ns+0x65/0x100
May 17 17:44:55 ubuntu kernel: [ 840.564574] [<ffffffff810814e9>]
create_new_namespaces+0xf9/0x180
May 17 17:44:55 ubuntu kernel: [ 840.564577] [<ffffffff81081731>]
unshare_nsproxy_namespaces+0x61/0xa0
May 17 17:44:55 ubuntu kernel: [ 840.564582] [<ffffffff81057b41>]
sys_unshare+0x181/0x2a0
May 17 17:44:55 ubuntu kernel: [ 840.564585] [<ffffffff816da99d>]
system_call_fastpath+0x1a/0x1f
================================================
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_netdevice: waiting for lo to
become free. Usage count = 2" will be continuously reported
The impacted jobs are,
https://jenkins.qa.ubuntu.com/view/Saucy/view/Smoke%20Testing/job/saucy-server-amd64-smoke-floodlight/15/
and
https://jenkins.qa.ubuntu.com/view/Saucy/view/Smoke%20Testing/job/saucy-server-i386-smoke-floodlight/13/
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.9.0-2-generic 3.9.0-2.6
ProcVersionSignature: Ubuntu 3.9.0-2.6-generic 3.9.2
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/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c',
'/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Date: Fri May 17 17:53:02 2013
HibernationDevice: RESUME=UUID=a9b2a509-9179-44d3-a4ea-807f7cd05d4e
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=/boot/vmlinuz-3.9.0-2-generic
root=UUID=810403bd-1b5c-4a51-bc07-6ce34be38cd9 nomodeset ro
RelatedPackageVersions:
linux-restricted-modules-3.9.0-2-generic N/A
linux-backports-modules-3.9.0-2-generic N/A
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:bvrBochs:bd01/01/2011:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs
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