unable to install node due to failure unmounting /dev on node

[Jeff Lane ]

This error is preventing me from deploying a node using Xenial and MAAS 1.9 from maas/proposed:

Running command ['umount', '/tmp/tmp_56nq7e0/target/dev'] with allowed return codes [0] (shell=False, capture=False)
umount: /tmp/tmp_56nq7e0/target/dev: target is busy
        (In some cases useful info about processes that
         use the device is found by lsof(8) or fuser(1).)
Traceback (most recent call last):
  File "/curtin/curtin/commands/main.py", line 208, in main
    ret = args.func(args)
  File "/curtin/curtin/commands/curthooks.py", line 724, in curthooks
    setup_grub(cfg, target)
  File "/curtin/curtin/commands/curthooks.py", line 354, in setup_grub
    util.install_packages(pkgs, target=target)
  File "/curtin/curtin/util.py", line 570, in install_packages
    aptopts=aptopts, target=target, env=env, allow_daemons=allow_daemons)
  File "/curtin/curtin/util.py", line 549, in run_apt_command
    apt_update(target, env=env, comment=' '.join(cmd))
  File "/curtin/curtin/util.py", line 515, in apt_update
    inchroot(update_cmd, env=env, retries=retries)
  File "/curtin/curtin/util.py", line 329, in __exit__
    do_umount(p)
  File "/curtin/curtin/util.py", line 221, in do_umount
    subp(['umount', mountpoint])
  File "/curtin/curtin/util.py", line 99, in subp
    return _subp(*args, **kwargs)
  File "/curtin/curtin/util.py", line 70, in _subp
    cmd=args)

I'm deploying using a Xenial image from today via the daily stream.

on my MAAS server I have:

maas 1.9.0+bzr4533-0ubuntu1~trusty1
maas-cert-server 0.2.13-0~43~ubuntu14.04.1
maas-cli 1.9.0+bzr4533-0ubuntu1~trusty1
maas-cluster-controller 1.9.0+bzr4533-0ubuntu1~trusty1
maas-common 1.9.0+bzr4533-0ubuntu1~trusty1
maas-dhcp 1.9.0+bzr4533-0ubuntu1~trusty1
maas-dns 1.9.0+bzr4533-0ubuntu1~trusty1
maas-proxy 1.9.0+bzr4533-0ubuntu1~trusty1
maas-region-controller 1.9.0+bzr4533-0ubuntu1~trusty1
maas-region-controller-min 1.9.0+bzr4533-0ubuntu1~trusty1
python-django-maas 1.9.0+bzr4533-0ubuntu1~trusty1
python-maas-client 1.9.0+bzr4533-0ubuntu1~trusty1
python-maas-provisioningserver 1.9.0+bzr4533-0ubuntu1~trusty1
curtin-common 0.1.0~bzr314-0ubuntu1
python-curtin 0.1.0~bzr314-0ubuntu1

[Jeff Lane  (bladernr)]

This is the curtin_userdata file from my maas server

#cloud-config
debconf_selections:
 maas: |
  {{for line in str(curtin_preseed).splitlines()}}
  {{line}}
  {{endfor}}
{{if third_party_drivers and driver}}
early_commands:
  {{py: key_string = ''.join(['\\x%x' % x for x in map(ord, driver['key_binary'])])}}
  driver_00_get_key: /bin/echo -en '{{key_string}}' > /tmp/maas-{{driver['package']}}.gpg
  driver_01_add_key: ["apt-key", "add", "/tmp/maas-{{driver['package']}}.gpg"]
  driver_02_add: ["add-apt-repository", "-y", "deb {{driver['repository']}} {{node.get_distro_series()}} main"]
  driver_03_update_install: ["sh", "-c", "apt-get update --quiet && apt-get --assume-yes install {{driver['package']}}"]
  driver_04_load: ["sh", "-c", "depmod && modprobe {{driver['module']}}"]
{{endif}}
late_commands:
  maas: [wget, '--no-proxy', '{{node_disable_pxe_url|escape.shell}}', '--post-data', '{{node_disable_pxe_data|escape.shell}}', '-O', '/dev/null']
{{if third_party_drivers and driver}}
  driver_00_key_get: curtin in-target -- sh -c "/bin/echo -en '{{key_string}}' > /tmp/maas-{{driver['package']}}.gpg"
  driver_02_key_add: ["curtin", "in-target", "--", "apt-key", "add", "/tmp/maas-{{driver['package']}}.gpg"]
  driver_03_add: ["curtin", "in-target", "--", "add-apt-repository", "-y", "deb {{driver['repository']}} {{node.get_distro_series()}} main"]
  driver_04_update_install: ["curtin", "in-target", "--", "apt-get", "update", "--quiet"]
  driver_05_install: ["curtin", "in-target", "--", "apt-get", "-y", "install", "{{driver['package']}}"]
  driver_06_depmod: ["curtin", "in-target", "--", "depmod"]
  driver_07_update_initramfs: ["curtin", "in-target", "--", "update-initramfs", "-u"]
{{endif}}

power_state:
  mode: reboot

{{if node.split_arch()[0] in {'i386', 'amd64'} }}
apt_mirrors:
  ubuntu_archive: http://{{main_archive_hostname}}/{{main_archive_directory}}
  ubuntu_security: http://{{main_archive_hostname}}/{{main_archive_directory}}
{{else}}
apt_mirrors:
  ubuntu_archive: http://{{ports_archive_hostname}}/{{ports_archive_directory}}
  ubuntu_security: http://{{ports_archive_hostname}}/{{ports_archive_directory}}
{{endif}}

{{if enable_http_proxy}}
{{if http_proxy }}
apt_proxy: {{http_proxy}}
{{else}}
apt_proxy: http://{{server_host}}:8000/
{{endif}}
{{endif}}

[Scott Moser (smoser)]

This is https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1527710
and was fixed in trunk at revno 328.

[Scott Moser (smoser)]

This bug is believed to be fixed in curtin in 17.1. If this is still a problem for you, please make a comment and set the state back to New

Thank you.