[Bug 1039196] [NEW] "unregister_netdevice: waiting for lo to become free." message after shutting down an lxc container

[Jean-Baptiste Lallement]

Public bug reported:

On Quantal, after I shutdown an lxc-container the following message is displayed in syslog every 10s:
Aug 20 21:50:23 sark kernel: [50270.380638] unregister_netdevice: waiting for lo to become free. Usage count = 1
Aug 20 21:50:34 sark kernel: [50280.617544] unregister_netdevice: waiting for lo to become free. Usage count = 1
Aug 20 21:50:44 sark kernel: [50290.854556] unregister_netdevice: waiting for lo to become free. Usage count = 1
Aug 20 21:50:54 sark kernel: [50301.091389] unregister_netdevice: waiting for lo to become free. Usage count = 1

Usage count maybe 1 or more.

Then I cannot start the container again and it completely blocks the
shutdown of the host system which is waiting for lo to become free.

Reboot is then forced with SysRq.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: lxc 0.8.0~rc1-4ubuntu26
ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
Uname: Linux 3.5.0-10-generic x86_64
ApportVersion: 2.4-0ubuntu8
Architecture: amd64
Date: Mon Aug 20 21:46:57 2012
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lxc
UpgradeStatus: Upgraded to quantal on 2012-01-31 (201 days ago)

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apparmor apport-bug qa-manual-testing quantal running-unity uec-images

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https://bugs.launchpad.net/bugs/1039196

Title:
  "unregister_netdevice: waiting for lo to become free." message after
  shutting down an lxc container

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