kernel-packages team mailing list archive

[Adam Conrad <adconrad@xxxxxxx>]

Hello Stephen, or anyone else affected,

Accepted cloud-init into trusty-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/cloud-
init/0.7.5-0ubuntu1.17 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: cloud-init (Ubuntu Trusty)
       Status: In Progress => Fix Committed

** Tags added: verification-needed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-lts-utopic in Ubuntu.
https://bugs.launchpad.net/bugs/1551419

Title:
  [SRU] Handle changing UUID endian-ness on Azure in cloud-init

Status in cloud-init package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed
Status in linux-keystone package in Ubuntu:
  Invalid
Status in linux-lts-utopic package in Ubuntu:
  New
Status in cloud-init source package in Trusty:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux-keystone source package in Trusty:
  Fix Committed
Status in linux-lts-utopic source package in Trusty:
  Fix Committed
Status in cloud-init source package in Vivid:
  Invalid
Status in linux source package in Vivid:
  Fix Committed
Status in linux-keystone source package in Vivid:
  Invalid
Status in linux-lts-utopic source package in Vivid:
  Invalid

Bug description:
  On Azure, cloud-init relies on the system-uuid as based by SMBIOS a
  unique ID for a cloud instance.  If this ID ever changes, then cloud-
  init will attempt to reprovision the VM.

  This recent kernel patch in the Ubuntu kernel incorrectly modifies the
  endianness for some SMBIOS fields, which has the effect causing cloud-
  init to think that the system-uuid has changed:
  http://kernel.ubuntu.com/git/ubuntu/ubuntu-
  trusty.git/commit/drivers/firmware?id=3ec24c55be6c543797ba3ee9a227a5631aef607e

  cloud-init needs to consider both the reported UUID and the "first
  three fields endian-reversed" UUID as the same, so that users shifting
  between unaffected kernels and affected kernels, or affected kernels
  and fixed kernels do not see their instances reprovisioned.

  [Impact]

  The impact is that cloud-init attempts to reprovision VMs when they
  reboot to use the new kernel, often causing the customer to lose
  access to their VM.

  Once the kernel is fixed, rebooting from an affected kernel to the new
  kernel will have the same effect.

  [Test Case]

  Failure:

  1) Boot an Azure instance using an image with a pre-broken kernel (e.g. b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04_3-LTS-amd64-server-20160201-en-us-30GB)
  2) Upgrade the kernel and reboot.
  3) SSH to the instance; you will observe that you are prompted to change SSH host keys because cloud-init has run again.

  Success (upgrade from not broken->broken):

  1) Boot an Azure instance using an image with a pre-broken kernel (e.g. b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04_3-LTS-amd64-server-20160201-en-us-30GB)
  2) Install the new version of cloud-init.
  3) Upgrade the kernel and reboot.
  4) Observe that you are not prompted when SSHing to instance, as cloud-init has not run again.
  5) Make a note of the instance ID in use (i.e. the target of /var/lib/cloud/instance
  6) Reboot again.
  7) Observe that the instance ID has not changed.

  Success (upgrade from broken->fixed):
  1) Boot an Azure instance using an image with a broken kernel (e.g. b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04_4-LTS-amd64-server-20160222-en-us-30GB)
  2) Install the new version of cloud-init.
  3) Upgrade to the fixed kernel (once it is available) and reboot.
  4) Observe that you are not prompted when SSHing to instance, as cloud-init has not run again.

  Success (upgrade from not broken->fixed):
  1) Boot an Azure instance using an image with a pre-broken kernel (e.g. b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu-14_04_3-LTS-amd64-server-20160201-en-us-30GB)
  2) Install the new version of cloud-init.
  3) Upgrade to the fixed kernel (once it is available) and reboot.
  4) Observe that you are not prompted when SSHing to instance, as cloud-init has not run again.

  [Regression Potential]

  The change is limited to the Azure data source.  It affects how
  instance IDs are determined, but the change does so in a limited way.

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