From: ebiederm@xxxxxxxxxxxx (Eric W. Biederman) Date: Wed, 05 Nov 2008 15:27:34 -0800 > > I have been tracking for a while a case where when the > network namespace exits the cleanup gets stck in an > endless precessess of: > > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > unregister_netdevice: waiting for lo to become free. Usage count = 3 > > It turns out that if you listen on a multicast address an unsubscribe > packet is sent when the network device goes down. If you shutdown > the network namespace without carefully cleaning up this can trigger > the unsubscribe packet to be sent over the loopback interface while > the network namespace is going down. > > All of which is fine except when we drop the packet and forget to > free it leaking the skb and the dst entry attached to. As it > turns out the dst entry hold a reference to the idev which holds > the dev and keeps everything from being cleaned up. Yuck! > > By fixing my earlier thinko and add the needed kfree_skb and everything > cleans up beautifully. > > Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> Applied. _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
