The reporter states in the linuxcontainers.org discussion and in this bug description that he's not using an Ubuntu kernel.
This is fixed in Ubuntu 18.04 and will soon be available in Ubuntu 16.04 via the hardware enablement kernel. I'm marking this Xenial task as Won't Fix in regards to its 4.4 kernel.
The reporter states in the linuxcontainers.org discussion and in this bug description that he's not using an Ubuntu kernel.
This is fixed in Ubuntu 18.04 and will soon be available in Ubuntu 16.04 via the hardware enablement kernel. I'm marking this Xenial task as Won't Fix in regards to its 4.4 kernel.