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

[Tim]

*** This bug is a duplicate of bug 1021471 ***
    https://bugs.launchpad.net/bugs/1021471

Same as Robert, and this only happens occasionally, I am using Ubuntu
12.10 kernel 3.6.3

Here is a log excerpt:

--Mount file system
kjournald starting.  Commit interval 5 seconds
EXT3-fs (dm-1): using internal journal
EXT3-fs (dm-1): mounted filesystem with ordered data mode
--lxc-start
device vethAUqDoX entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): vethAUqDoX: link is not ready
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
unregister_netdevice: waiting for lo to become free. Usage count = 1
INFO: task lxc-start:3820 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
lxc-start       D 0000000000000000     0  3820      1 0x00000000
 ffff88001c119ca0 0000000000000286 ffff88001c119c50 ffffffff8113528d
 ffff88001c119fd8 ffff88001c119fd8 ffff88001c119fd8 0000000000013dc0
 ffff88000b352da0 ffff880012d1db40 ffff88001c119ca0 ffffffff81cad260
Call Trace:
 [<ffffffff8113528d>] ? free_pages+0x3d/0x40
 [<ffffffff8169e459>] schedule+0x29/0x70
 [<ffffffff8169e71e>] schedule_preempt_disabled+0xe/0x10
 [<ffffffff8169d347>] __mutex_lock_slowpath+0xd7/0x150
 [<ffffffff8169cf5a>] mutex_lock+0x2a/0x50
 [<ffffffff8157de74>] copy_net_ns+0x84/0x110
 [<ffffffff8108192b>] create_new_namespaces+0xdb/0x190
 [<ffffffff81081b1c>] copy_namespaces+0x8c/0xd0
 [<ffffffff8105513b>] ? dup_mm+0x13b/0x240
 [<ffffffff81055960>] copy_process.part.24+0x6e0/0xec0
 [<ffffffff810561b7>] copy_process+0x77/0x80
 [<ffffffff810562ea>] do_fork+0xfa/0x290
 [<ffffffff8117821f>] ? kmem_cache_free+0x2f/0x110
 [<ffffffff81191035>] ? putname+0x35/0x50
 [<ffffffff8101d638>] sys_clone+0x28/0x30
 [<ffffffff816a7ef3>] stub_clone+0x13/0x20
 [<ffffffff816a7be9>] ? system_call_fastpath+0x16/0x1b

 --Repeated unregister_netdevice, then lxc-start blocked message

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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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