There is an upstream kernel fix for this:

https://lists.linuxfoundation.org/pipermail/containers/2017-January/037759.html

Until this is merged and then backported, I appended a workaround
whereby runC's init process will only set itself undumpable when it is
not running in a user namespace.


** Patch added: "0001-nsexec-make-runC-Docker-work-in-unpriv-LXD.patch"
   
https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1655906/+attachment/4805948/+files/0001-nsexec-make-runC-Docker-work-in-unpriv-LXD.patch

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https://bugs.launchpad.net/bugs/1655906

Title:
  Please upgrade docker.io to latest 1.12.6

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