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[James Hunt <1263738@xxxxxxxxxxxxxxxxxx>]

> I haven't been able to find where in upstart this is happening, but on the kernel side I can tell that it's due to an open() without
> O_NOCTTY. 

Upstart does not open /dev/console without O_NOCTTY afaics. Are you sure
your kernel debug is showing pid 1 is doing this?

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https://bugs.launchpad.net/bugs/1263738

Title:
  login console 0 in user namespace container is not configured right

Status in Upstart:
  New
Status in “linux” package in Ubuntu:
  Confirmed
Status in “lxc” package in Ubuntu:
  Triaged
Status in “linux” source package in Trusty:
  Confirmed
Status in “lxc” source package in Trusty:
  Triaged

Bug description:
  When you create a container in a private user namespace, when you start the
  container without the '-d' flag, that console is not properly set up.  Logging in
  gives you

  -bash: no job control in this shell

  and hitting ctrl-c reboots the container.

  Consoles from 'lxc-console -n $container' behave correctly.

  This may be a kernel issue, as discussed here:

  http://lists.linuxcontainers.org/pipermail/lxc-
  devel/2013-October/005843.html

  so also marking this as affecting the kernel.

  This can be worked around, but really needs to be fixed before trusty
  is frozen.

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