[Bug 1824804] Re: Unattended upgrades falls back to adjust all upgradable packages in attempt to install held packages

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 1.10ubuntu5

---------------
unattended-upgrades (1.10ubuntu5) disco; urgency=medium

  * Adjust only transitive dependencies in the fallback
    when a package from an allowed origin can't be marked to install/upgrade.
    This is a much lighter approach than marking every upgradable package because
    the full fallback was triggered on packages held back as well, using an
    excessive amount of CPU time.
    Also it crashed with packages not having any version in allowed origins.
    (LP: #1824804, #1824949)

 -- Balint Reczey <rbalint at ubuntu.com>  Tue, 16 Apr 2019 08:54:49 +0200

** Changed in: unattended-upgrades (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1824804

Title:
  Unattended upgrades falls back to adjust all upgradable packages in
  attempt to install held packages

Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  [Impact]

   * The fix for LP: #1821101 allowed installing packages for which
  APT's resolver could not find solution for without adjusting other
  packages, but also tries to adjust many packages to install packages
  which are held back.

  [Test Case]

   * Set up a system where systemd (or a package that can't be upgraded
  without also upgrading other packages) need to be upgraded to the
  version in -security.

   * Mark systemd on hold
     apt mark hold systemd

   * Observe u-u falling back to adjusting all upgradable packages in
  unfixed versions and adjusting only a few in fixed versions:

  # unattended-upgrade --verbose --debug
  ...

  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  falling back to marking libnss-systemd, then adjusting changes
  package libnss-systemd upgradable but fails to be marked for upgrade (E:Unable to correct problems, you have held broken packages.)
  falling back to adjusting all packages
  adjusting candidate version: 2ping=4.1-1
  ...

    Fixed:
  ...
  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  falling back to adjusting libnss-systemd's dependencies recursively
  adjusting candidate version: libnss-systemd=237-3ubuntu10.19
  adjusting candidate version: libkmod2=24-1ubuntu3
  adjusting candidate version: mount=2.31.1-0.4ubuntu3
  adjusting candidate version: libmount1=2.31.1-0.4ubuntu3
  ...

  [Regression Potential]

   * The less extensive fallback may not find solutions for installing
  packages with special relationships that the full fallback could have
  found, but I don't know about such special cases in the archive and
  the autopkgtest cover a fair set of popular packages. Keeping back
  those packages seems to be better than spending a lot of CPU time on
  finding a few solutions - which still was not enough to find _all_
  solutions.

  
  [Other Info]

  Originally reported at: https://bugs.launchpad.net/ubuntu/+source
  /unattended-upgrades/+bug/1396787/comments/21

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