[Bug 1826157] Re: unattended-upgrades: rewind_cache() may crash due to not adjusting package candidates

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 1.10ubuntu5.1

---------------
unattended-upgrades (1.10ubuntu5.1) disco; urgency=medium

  * Skip trying to upgrade held packages in call_adjusted() (LP: #1824804)
  * Follow all kinds of transitive dependencies when adjusting dependencies
    (LP: #1824804)
  * Detect unchanged moved conffiles.
    When a package moves a conffile properly without any change no conffile
    prompt needs to be shown thus the package can be upgraded unattended even
    when the conffile is changed locally. (LP: #1823872)
  * Don't crash collecting transitive dependencies when package has no candidate
    (LP: #1825886)
  * Use mark_install_adjusted() in rewind_cache()
    The original cache had packages marked with adjustments thus rewinding
    should also do adjustments to reach the same state.
    Also not using mark_install_adjusted() crashes when apt raises error on
    held packages. (LP: #1826157)
    - test_rewind: Update test to check if adjusted rewinding took place

 -- Balint Reczey <rbalint at ubuntu.com>  Fri, 26 Apr 2019 15:00:50 +0200

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https://bugs.launchpad.net/bugs/1826157

Title:
  unattended-upgrades: rewind_cache() may crash due to not adjusting
  package candidates

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Fix Released
Status in unattended-upgrades source package in Cosmic:
  Fix Released
Status in unattended-upgrades source package in Disco:
  Fix Released

Bug description:
  [Impact]

   * Unattended-upgrades may crash when rewinding cache due to not adjusting package candidates before marking them to upgrade/install.
   * The fix is using adjusted marking that in effect rewinds the cache to the right, adjusted state.

  [Test Case]

   * test/test_rewind.py is updated to verify that rewinding included adjustments and it is ran during the build.
   * Also watch the error not happening anymore.

  [Regression Potential]

   * The fix is very small and is not likely to cause any regression.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.10ubuntu5, the problem page at https://errors.ubuntu.com/problem/6f57d938f3aa56b3995d5bccf4637d65734d78e4 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

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