[Bug 2029952] Please test proposed package

[Robie Basak]

Hello Edward, or anyone else affected,

Accepted python-oslo.privsep into jammy-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/python-
oslo.privsep/2.7.0-0ubuntu2 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 on 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, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: python-oslo.privsep (Ubuntu Focal)
       Status: Triaged => Fix Committed

** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/2029952

Title:
  [SRU] backport msgpack max_buffer_size patch to Focal

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Fix Committed
Status in Ubuntu Cloud Archive wallaby series:
  Fix Committed
Status in Ubuntu Cloud Archive xena series:
  Fix Committed
Status in Ubuntu Cloud Archive yoga series:
  Triaged
Status in python-oslo.privsep package in Ubuntu:
  Fix Released
Status in python-oslo.privsep source package in Focal:
  Fix Committed
Status in python-oslo.privsep source package in Jammy:
  Fix Committed

Bug description:
  [Impact]
  Hosts running Openstack Neutron from Ussuri to Yoga release are impacted by
  the fact that their use of oslo.privsep is thwarted by a default buffer size
  on python-msgpack such that commands that return strings > 1MB in size cause
  privsep to crash and agents to stop working. This patch backports a fix that
  increased the buffer size to one that is more appropriate to neutron usage.

  [Test Plan]

    * deploy Openstack (version corresponding to release of SRU) with l3ha
    * need at least one compute host and two neutron-gateway hosts
    * create a large number of routers each with several networks attached
    * restart neutron-l3-agent
    * wait for restart to complete then do 'journalctl --unit neutron-l3-agent --grep ValueError'
    * if the error does not appear then the patch is working
    * note that it is necessary to create routers with enough networks and ports to trigger the > 1MB size limit for the netlink info message returned by privsep to trigger

  [Where problems could occur]
  No regressions are expected to occur as a result of this patch as it is
  increasing the buffer size by a fairly small amount to allow neutron
  function correctly in loaded environments.

  --------------------------------------------------------------------------------

  The main explanation for this backport can be found in
  https://bugs.launchpad.net/ubuntu/+source/python-
  oslo.privsep/+bug/1896734/comments/37 but I'm opening a new bug for
  the privsep backport since 1896734 was used to backport a neutron fix.

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