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[Launchpad Bug Tracker <1691489@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
0.7.9-233-ge586fe35-0ubuntu1~16.04.1

---------------
cloud-init (0.7.9-233-ge586fe35-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * debian/cloud-init.templates: enable Scaleway cloud.
  * debian/cloud-init.templates: enable Aliyun cloud.
  * drop the following cherry picks, now incorporated in snapshot.
    + debian/patches/cpick-5fb49bac-azure-identify-platform...
    + debian/patches/cpick-003c6678-net-remove-systemd-link...
    + debian/patches/cpick-1cd4323b-azure-remove-accidental...
    + debian/patches/cpick-ebc9ecbc-Azure-Add-network-config...
    + debian/patches/cpick-11121fe4-systemd-make-cloud-final...
  * debian/patches/stable-release-no-jsonschema-dep.patch:
    add patch to remove optional dependency on jsonschema.
  * New upstream snapshot.
    - cloudinit.net: add initialize_network_device function and tests
      [Chad Smith]
    - makefile: fix ci-deps-ubuntu target [Chad Smith]
    - tests: adjust locale integration test to parse default locale.
    - tests: remove 'yakkety' from releases as it is EOL.
    - centos: do not package systemd-fsck drop-in.
    - systemd: make systemd-fsck run after cloud-init.service (LP: #1691489)
    - tests: Add initial tests for EC2 and improve a docstring.
    - locale: Do not re-run locale-gen if provided locale is system default.
    - archlinux: fix set hostname usage of write_file. [Joshua Powers]
    - sysconfig: support subnet type of 'manual'.
    - tools/run-centos: make running with no argument show help.
    - Drop rand_str() usage in DNS redirection detection
      [Bob Aman] (LP: #1088611)
    - sysconfig: use MACADDR on bonds/bridges to configure mac_address
      [Ryan Harper]
    - net: eni route rendering missed ipv6 default route config
      [Ryan Harper] (LP: #1701097)
    - sysconfig: enable mtu set per subnet, including ipv6 mtu
      [Ryan Harper]
    - sysconfig: handle manual type subnets [Ryan Harper]
    - sysconfig: fix ipv6 gateway routes [Ryan Harper]
    - sysconfig: fix rendering of bond, bridge and vlan types.
      [Ryan Harper]
    - Templatize systemd unit files for cross distro deltas. [Ryan Harper]
    - sysconfig: ipv6 and default gateway fixes. [Ryan Harper]
    - net: fix renaming of nics to support mac addresses written in upper
      case. (LP: #1705147)
    - tests: fixes for issues uncovered when moving to python 3.6.
    - sysconfig: include GATEWAY value if set in subnet
      [Ryan Harper]
    - Scaleway: add datasource with user and vendor data for Scaleway.
      [Julien Castets]
    - Support comments in content read by load_shell_content.
    - cloudinitlocal fail to run during boot [Hongjiang Zhang]
    - doc: fix disk setup example table_type options [Sandor Zeestraten]
    - tools: Fix exception handling. [Joonas Kylmälä]
    - tests: fix usage of mock in GCE test.
    - test_gce: Fix invalid mock of platform_reports_gce to return False
      [Chad Smith]
    - test: fix incorrect keyid for apt repository.  [Joshua Powers]
    - tests: Update version of pylxd [Joshua Powers]
    - write_files: Remove log from helper function signatures.
      [Andrew Jorgensen]
    - doc: document the cmdline options to NoCloud [Brian Candler]
    - read_dmi_data: always return None when inside a container. (LP: #1701325)
    - requirements.txt: remove trailing white space.
    - Tests: Simplify the check on ssh-import-id [Joshua Powers]
    - tests: update ntp tests after sntp added [Joshua Powers]
    - FreeBSD: Make freebsd a variant, fix unittests and
      tools/build-on-freebsd.
    - FreeBSD: fix test failure
    - FreeBSD: replace ifdown/ifup with "ifconfig down" and "ifconfig up".
      [Hongjiang Zhang]
    - FreeBSD: fix cdrom mounting failure if /mnt/cdrom/secure did not exist.
      [Hongjiang Zhang]
    - main: Don't use templater to format the welcome message
      [Andrew Jorgensen]
    - docs: Automatically generate module docs form schema if present.
      [Chad Smith]
    - debian: fix path comment in /etc/hosts template. [Jens Sandmann]
    - suse: add hostname and fully qualified domain to template.
      [Jens Sandmann]
    - write_file(s): Print permissions as octal, not decimal [Andrew Jorgensen]
    - ci deps: Add --test-distro to read-dependencies to install all deps
      [Chad Smith]
    - tools/run-centos: cleanups and move to using read-dependencies
    - pkg build ci: Add make ci-deps-<distro> target to install pkgs
      [Chad Smith]
    - selinux: Allow restorecon to be non-fatal. [Ryan Harper]
    - net: Allow netinfo subprocesses to return 0 or 1 due to selinux.
      [Ryan Harper]
    - net: Allow for NetworkManager configuration [Ryan McCabe]
    - Use distro release version to determine if we use systemd in redhat spec
      [Ryan Harper]
    - net: normalize data in network_state object
    - Integration Testing: tox env, pyxld 2.2.3, and revamp framework
      [Wesley Wiedenmeier]
    - Chef: Update omnibus url to chef.io, minor doc changes. [JJ Asghar]
    - tools: add centos scripts to build and test [Joshua Powers]
    - Drop cheetah python module as it is not needed by trunk [Ryan Harper]
    - rhel/centos spec cleanups.
    - cloud.cfg: move to a template.  setup.py changes along the way.
    - Makefile: add deb-src and srpm targets. use PYVER more places.
    - makefile: fix python 2/3 detection in the Makefile [Chad Smith]
    - snap: Removing snapcraft plug line [Joshua Powers]
    - RHEL/CentOS: Fix default routes for IPv4/IPv6 configuration.
      [Andreas Karis]
    - test: Fix pyflakes complaint of unused import. [Joshua Powers]
    - NoCloud: support seed of nocloud from smbios information
      [Vladimir Pouzanov] (LP: #1691772)
    - net: when selecting a network device, use natural sort order
      [Marc-Aurèle Brothier]
    - fix typos and remove whitespace in various docs [Stephan Telling]
    - systemd: Fix typo in comment in cloud-init.target. [Chen-Han Hsiao]
    - Tests: Skip jsonschema related unit tests when dependency is absent.
      [Chad Smith]
    - tools/net-convert.py: support old cloudinit versions by using kwargs.
    - ntp: Add schema definition and passive schema validation.
      [Chad Smith] (LP: #1692916)
    - Fix eni rendering for bridge params that require repeated key for
      values. [Ryan Harper] (LP: #1706752)
    - AliYun: Enable platform identification and enable by default.
      [Junjie Wang] (LP: #1638931)

 -- Scott Moser <smoser@xxxxxxxxxx>  Mon, 31 Jul 2017 16:36:16 -0400

** Changed in: cloud-init (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1691489

Title:
  fstab entries written by cloud-config may not be mounted

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Released
Status in cloud-init source package in Yakkety:
  Confirmed
Status in cloud-init source package in Zesty:
  Fix Released
Status in cloud-init source package in Artful:
  Fix Released

Bug description:
  === Begin SRU Template ===
  [Impact]
  There is a race condition on a re-deployment of cloud-init on Azure
  where /mnt will not get properly formatted or mounted.  This is due to
  "dirty" entries in /etc/fstab that cause a device to be busy when
  cloud-init goes to format it.  This shows itself usually as 'mkfs'
  complaining that the device is busy.  The cause is that systemd
  starts an fsck and collides with cloud-init re-formatting the disk.

  The problem can be seen other places but seemed to be most reproducible
  and originally found on Azure.

  [Test Case]
  1.) Launch a Azure vm, ideally size L32S.
  2.) Log in and verify the system properly mounted /mnt.
  3.) Re-deploy the vm through the web ui and try again.

  [Regression Potential]
  Worst case scenario, these changes unnecessarily slow down boot and 
  do not fix the problem.

  [Other Info]
  Upstream commit at
    https://git.launchpad.net/cloud-init/commit/?id=1f5489c258

  === End SRU Template ===

  
  As reported in bug 1686514, sometimes /mnt will not get mounted when re-delpoying or stopping-then-starting a Azure vm of L32S.  This is probably a more generic issue, I suspect shown due to the speed of disks on these systems.

  Related bugs:
   * bug 1686514: Azure: cloud-init does not handle reformatting GPT partition ephemeral disks

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