[Bug 1871149] Re: False apt_pkg.CacheMismatchError

[Balint Reczey]

** Tags removed: rls-ff-incoming

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Title:
  False apt_pkg.CacheMismatchError

Status in python-apt package in Ubuntu:
  Incomplete

Bug description:
  Python-apt throws CacheMismatchError which is almost certainly false:

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 2512, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1986, in main
      res = run(options, rootdir, mem_log, logfile_dpkg,
    File "/usr/bin/unattended-upgrade", line 2398, in run
      new_pending_autoremovals = get_auto_removable(cache)
    File "/usr/bin/unattended-upgrade", line 1789, in get_auto_removable
      return {pkg.name for pkg in cache
    File "/usr/bin/unattended-upgrade", line 1790, in <setcomp>
      if pkg.is_auto_removable}
    File "/usr/lib/python3/dist-packages/apt/package.py", line 1269, in is_auto_removable
      self._pcache._depcache.is_garbage(self._pkg))
  apt_pkg.CacheMismatchError: Object of different cache passed as argument to apt_pkg.DepCache method

  The relevant code in u-u:

  def get_auto_removable(cache):                                                                                                                                                
      # type: (apt.Cache) -> AbstractSet[str]                                                                                                                                   
      return {pkg.name for pkg in cache                                                                                                                                         
              if pkg.is_auto_removable}

  ---

  The Ubuntu Error Tracker has been receiving reports about a problem 
  regarding unattended-upgrades.  This problem was most recently seen with package version 2.1, the problem page at https://errors.ubuntu.com/problem/ff08f6aa104f8e3233da3081835ecc2e9f0452f5 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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