*** 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 -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1039196 Title: "unregister_netdevice: waiting for lo to become free." message after shutting down an lxc container To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1039196/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs