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[Colin Watson <cjwatson@xxxxxxxxxxxxx>]

** Attachment added: "strace"
   https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1516037/+attachment/4518284/+files/lxc-start.trace

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https://bugs.launchpad.net/bugs/1516037

Title:
  lxc-start fails with 1.1.5-0ubuntu1

Status in lxc package in Ubuntu:
  New

Bug description:
  After upgrading to lxc 1.1.5-0ubuntu1, lxc-start fails like this:

  lxc-start: start.c: preserve_ns: 149 Permission denied - failed to open '/proc/7170/ns/mnt'
  lxc-start: start.c: lxc_spawn: 993 failed to store namespace references
  lxc-start: start.c: __lxc_start: 1192 failed to spawn 'trusty-lpdev'
  lxc-start: lxc_start.c: main: 344 The container failed to start.
  lxc-start: lxc_start.c: main: 348 Additional information can be obtained by setting the --logfile and --logpriority options.

  This is with a trusty system container.  precise system containers
  behave similarly.  I don't have others to try.  Downgrading liblxc1,
  lxc, lxc-templates, and python3-lxc to version 1.1.4-0ubuntu3 causes
  lxc-start to work again.

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