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[Serge Hallyn <1543367@xxxxxxxxxxxxxxxxxx>]

Sorry, I had forgotten my own workaround for this.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Won't Fix

** Changed in: lxc (Ubuntu)
       Status: Triaged => Fix Released

** Changed in: linux (Ubuntu)
       Status: Won't Fix => Invalid

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https://bugs.launchpad.net/bugs/1543367

Title:
  nested unprileged container fails to start at mounting /proc

Status in linux package in Ubuntu:
  Invalid
Status in lxc package in Ubuntu:
  Fix Released

Bug description:
  Create a trusty or xenial host.  Probably use ubuntu-lxc/daily ppa to
  work around other bugs.

  Create a privileged container (again either trusty or xenial will do),
  and install ubuntu-lxc/daily ppa there.

  Create an unprivileged container in that container.  It will fail at
  mounting proc using safe_mount.  At this point it is mounting proc
  onto /proc/self/fd/14 flags 14.

        lxc-start 20160208234209.189 ERROR    lxc_utils -
  utils.c:safe_mount:1695 - Operation not permitted - Failed to mount
  proc onto /usr/lib/x86_64-linux-gnu/lxc/proc

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