[Bug 664514] Re: Unattended upgrade fails with segmentation fault in Ubuntu Server 10.10

[Jamie Strandboge]

After discussing this with Michael Vogt, the patch for maverick is
incorrect. The correct fix has actually already been uploaded to
maverick-proposed and is pending review by the SRU team. This SRU is
being tracked in bug #655154.

** Changed in: python-apt (Ubuntu Maverick)
       Status: New => Invalid

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Title:
  Unattended upgrade fails with segmentation fault in Ubuntu Server
  10.10

Status in Python-APT:
  Fix Released
Status in “python-apt” package in Ubuntu:
  Fix Released
Status in “python-apt” source package in Maverick:
  Invalid
Status in “python-apt” package in Debian:
  Unknown

Bug description:
  [SRU for maverick]

  * This bug makes unattended-upgrade completely unusable.
  * This bug was fixed in upstream version 0.7.98.
  * Just one-line backporting
    https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/664514/+attachment/1769035/+files/python-apt_0.7.96.1ubuntu11.debdiff

  TEST CASE:
  1. Use out-of-date system which has security update notification
  2. Run "$ sudo apt-get upgrade --download-only"
  3. Run "$ sudo unattended-upgrade -d" and get Segmentation fault
  4. Upgrade to -proposed package
  5. Run "$ sudo unattended-upgrade -d" and all security updates get installed

  -----
  After upgrading from Ubuntu Server 10.04 to Ubuntu Server 10.10, I noticed that security updates were no longer being applied automatically (contrary to my configuration).

  I did some poking around in the apt script (in etc/cron.daily).  Here
  is the output with debug mode on.  (I cleared out the time stamp files
  to force it to update now so errors regarding those are not
  important.)

  power status (255) undetermined, continuing
  system is on main power.
  sleeping for 739 seconds
  check_stamp: missing time stamp file: /var/lib/apt/periodic/update-stamp.
  apt-key net-update (success)
  download updated metadata (success).
  send dbus signal (success)
  X11 connection rejected because of wrong authentication.
  check_stamp: missing time stamp file: /var/lib/apt/periodic/download-upgradeable-stamp.
  download upgradable (success)
  check_stamp: missing time stamp file: /var/lib/apt/periodic/upgrade-stamp.
  Segmentation fault
  unattended-upgrade (error)
  check_stamp: missing time stamp file: /var/lib/apt/periodic/autoclean-stamp.
  autoclean (success).
  aged: ctime <30 and mtime <30 and ctime>2 and mtime>2
  end remove by archive size: size=412396 < 512000

  So, what's that seg fault in the middle there?  Turns out it is the
  call to /usr/bin/unattended-upgrade.

  I can actually reproduce it like this:

  $ sudo unattended-upgrade
  Segmentation fault

  Now, this is about all I know how to do to debug the issue.  If you'd
  like me to run a stack trace or something on unattended-upgrade to
  figure out why it is crashing, please point me towards some directions
  to do so.  (I notice that it is a python script and I am not very
  familiar with python.)  In any case, this is a security issue, since
  security updates cannot be installed automatically, I have to remember
  to check the server often to make sure that security updates are
  applied.