I’ve got three of these messages repeating in the syslog for some of my rancher hosts, seemingly repeating 3 times every 10 seconds.
Message from syslogd@rancher05 at Nov 3 00:16:59 ... kernel:[17152.031039] unregister_netdevice: waiting for lo to become free. Usage count = 3
This seems to have showed up after the latest update which uses the following versions:
Component Version Rancher v0.43.1 Cattle v0.106.0 User Interface v0.63.0 Rancher Compose v0.5.0
It looks like the Ubuntu folks fixed this very recently (within 5 days), and just wanted to let it percolate up in case others happened to find themselves with the same situation.
The symptoms are that the server is useless, and Docker isn’t responding properly until the server is rebooted.
The relevant bug is at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1403152