RHEL7 and kubernetes: kernel:unregister_netdevice: waiting for eth0 to become free. Usage count = 1

Solution Verified - Updated -

Issue

  • We are trying to prototype kubernetes on top of RHEL and encounter the situation that the device seems to be frozen. There are repeated messages similar to:
[1331228.795391] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331238.871337] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331248.919329] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
[1331258.964322] unregister_netdevice: waiting for eth0 to become free. Usage count = 1
  • This problem occurs when scaling down pods in kubernetes. A reboot of the node is required to rectify.
  • This has been seen after customers upgraded to a kernel with the fix for https://access.redhat.com/solutions/3105941 But after that the messages appear on ethX instead of lo.

Environment

  • Red Hat Enterprise Linux 7
    • kernel-3.10.0-862.el7.x86_64
    • kernel-3.10.0-957.el7.x86_64
  • upstream Kubernetes
  • upstream docker

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