Hi Kamal, There's an issue in pipework that it can result in kernel panic in ubuntu 3.13 kernel. https://github.com/jpetazzo/pipework/issues/79 We found the bug was introduced in 3.13 and was fixed in 3.14 by commit da37705cef30841616ed644ff33455bbc7374db0 Author: Cong Wang <cwang@xxxxxxxxxxxxxxxx> Date: Tue Feb 11 15:51:29 2014 -0800 macvlan: unregister net device when netdev_upper_dev_link() fails You probably want to queue it for 3.13.y-ckt. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html