[Bug 1051080] [NEW] lxc-start-ephemeral hangs if bind mounting nfs homedir

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On Ubuntu 12.04.1, ephemeral containers seem to conflict with NFS home
directories.

The user's home directory is on a remote NFS server.
The original container is created with 
  sudo lxc-create -t ubuntu -n foobar -- -r lucid  --bindhome $LOGNAME
The ephemeral container is started with
  lxc-start-ephemeral -o foobar
The user logs in to the ephemeral container.  This hangs.

After that, any reference to the home directory -- inside or outside of
the container -- seems to hang.

mount in the container shows:

none on / type overlayfs (rw,relatime,lowerdir=/var/lib/lxc/buildhost2-ubu10,upperdir=/tmp/lxc-lp-v92y7NU)
none on /mnt/home/builder type overlayfs (rw,relatime,lowerdir=/mnt/home/builder,upperdir=/var/lib/lxc/buildhost2-ubu10-temp-loNNGB5/ephemeralbind/mnt/home/builder)

mount outside the container shows:
obnas1a:/vol/homes/builder 419430400 362328576  57101824  87% /mnt/home/builder
But sometimes, mount outside the container shows nothing for /mnt/home/builder after the problem happens.

This seems 100% repeatable.

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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lxc-start-ephemeral hangs if bind mounting nfs homedir
https://bugs.launchpad.net/bugs/1051080
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