[Bug 1880987] Re: [SRU] /usr/bin/update-manager:TypeError:_on_finished:_action_done:get_deb2snap_dups:_on_finished:_action_done:get_deb2snap_dups

[Brian Murray]

Looking at the bucket for this crash at errors.ubuntu.com I only see a
couple of instances of this crash with the version of the package from
-proposed and those are likely noise. So I'm setting this to
verification-done.

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

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Title:
  [SRU] /usr/bin/update-
  manager:TypeError:_on_finished:_action_done:get_deb2snap_dups:_on_finished:_action_done:get_deb2snap_dups

Status in update-manager package in Ubuntu:
  Fix Released
Status in update-manager source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding update-manager.  This problem was most recently seen with package version 1:20.04.10, the problem page at https://errors.ubuntu.com/problem/b2c8bc0cb8285d022b6b6aa8a75000e6d82dab19 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/.

  [Test Case]

  This is reproducable by raising an AssertionError during the
  initialization of MyCache in "UpdateManager/backend/__init__.py"
  whereby the cache is then assigned to None:

          except Exception as e:
              logging.debug("error reading cache (%s)" % e)
              cache = None

  [Regression Potential]

  Instead of assigning the cache to None and attempting to continue the
  duplicates check, we now just return an empty array. It's perfectly
  safe to postpone this duplicates check to a later update, so there's
  little regression potential as far as I can see.

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