[Bug 1396787] Re: checking trust of archives eats a lot of cpu

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 1.4ubuntu1

---------------
unattended-upgrades (1.4ubuntu1) cosmic; urgency=medium

  * Merge from Debian unstable
    - Remaining changes:
      - unattended-upgrades: Do not automatically upgrade the development
        release of Ubuntu unless Unattended-Upgrade::DevRelease is true.
    - Dropped changes, included in Debian:
      - Stop rewriting test apt.conf in test_untrusted.py.
      - Fix test_on_battery on Ubuntu development releases

unattended-upgrades (1.4) unstable; urgency=medium

  * Skip starting init.d script in debhelper-generated postinst part
    (LP: #1778800)
  * Use "deb-systemd-invoke start" instead of "systemctl start" in postinst.
    It is used only in a workaround applied for a Debian bug and for upgrading
    from pre-bionic versions.
  * Clear cache when autoremoval is invalid for a package set marked for
    removal (LP: #1779157)
  * Clear cache after failed commits to return from a possibly invalid state
  * Unlock for dpkg operations with apt_pkg.pkgsystem_unlock_inner() when it
    is available, also stop running when reacquiring the lock fails.
    Thanks to to Julian Andres Klode for original partial patch
  * Use fully qualified domain name in email subject.
  * Send email about all failures and crashes (Closes: #898607)
  * Add short textual summary of the results in the summary email
  * Recommend overriding configuration in a separate file.
    This can be better than changing /etc/apt/apt.conf.d/50unattended-upgrades
    because package updates don't conflict with local changes this way.
  * Adjust candidates only for packages to be possibly installed
    (Closes: #892028, #899366) (LP: #1396787)
  * Add Unattended-Upgrade::OnlyOnACPower config file example for all
    distributions
  * debian/control: Drop redundant Testsuite: autopkgtest field to keep Lintian
    happy
  * Bump Standards-Version to 4.1.4
  * Add debian/tests/upgrade-all-security to install all current security
    updates. On development releases this tests latest stable, on stable
    releases it tests the release itself.
  * Skip updates on metered connections (Closes: #855570)
  * Quote shell variables in autopkgtest
  * Stop u-u early when it should stop later anyway
  * Measure time for --dry-run and after all updates are installed in
    autopkgtests
  * Filter out packages cheaper when they are not from allowed origins
  * Collect autoremovable packages, too, when looking for upgradable ones

 -- Balint Reczey <rbalint at ubuntu.com>  Fri, 06 Jul 2018 13:33:29 +0200

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

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https://bugs.launchpad.net/bugs/1396787

Title:
  checking trust of archives eats a lot of cpu

Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  (System: Ubuntu 14.04, up to date packages)

  I noticed that unattended-upgrades spends a significant amount of time
  in phases where it runs at 100% cpu. On a slower machine (core 2 t7200
  2GHz) this goes on for minutes rather than seconds. This interferes
  with using the machine for other tasks.

  Using the --debug option to unattended-upgrades shows that the program
  outputs a lot of lines like the following during these 100% cpu
  phases:

  matching 'a'='trusty-updates' against '<Origin component:'universe'
  archive:'trusty-updates' origin:'Ubuntu' label:'Ubuntu'
  site:'de.archive.ubuntu.com' isTrusted:True>

  From this output I guess the operation executed is not so complicated
  that it should require so much cpu power. ??

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unattended-upgrades 0.82.1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  Date: Wed Nov 26 21:53:57 2014
  InstallationDate: Installed on 2014-08-28 (90 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: unattended-upgrades
  UpgradeStatus: No upgrade log present (probably fresh install)

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