Bug#878827: Auto-login no longer works as of 3.26.0-1 [Regression]

[Jason Wittlin-Cohen]

Package: gdm3
Version: 3.26.1-3
Severity: normal

Dear Maintainer,

   * What led up to the situation?

I noticed that auto-login stopped working in GDM after the package was
updated
from 3.25.90.1-2 to 3.26.0-1. I did not make any configuration changes
between
versions.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

I use ZFS for my root filesystem.  To test my theory that the GDM update
broke
auto-login, I cloned a snapshot with gdm3 3.25.90.1-2 and confirmed that
auto-
login worked.  I then held gdm3 and upgraded all remaining packages to
ensure
the system was otherwise up-to-date.  After a reboot, auto-login continued
to
function.  I then updated gdm3 and its libraries to the latest version
(3.26.1-3).

To determine when auto-login ceased functioning, I cloned a later snapshot
with
3.26.0-1. This version also fails to auto-login. Thus, it appears that the
regression I am seeing was introduced in 3.26.0-1.

The 3.26.0-1 release also contains a seemingly relevant change: "Fix for
unauthenticated unlock when autologin is enabled (CVE-2017-12164)"

   * What was the outcome of this action?

As of gdm3 3.26.0-1, when I restart my machine I am presented with a GDM
login
screen, as if auto-login was disabled.

   * What outcome did you expect instead?

I expected to be automatically logged into GNOME with my selected user
account.
In other words, I expected the behavior to be the same as prior versions.



-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (900, 'testing'), (800, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.45-1
ii  adduser                               3.116
ii  dconf-cli                             0.26.0-2+b1
ii  dconf-gsettings-backend               0.26.0-2+b1
ii  debconf                               1.5.63
ii  gir1.2-gdm-1.0                        3.26.1-3
ii  gnome-session [x-session-manager]     3.24.1-2
ii  gnome-session-bin                     3.24.1-2
ii  gnome-settings-daemon                 3.24.3-1
ii  gnome-shell                           3.22.3-3
ii  gnome-terminal [x-terminal-emulator]  3.26.1-1
ii  gsettings-desktop-schemas             3.24.1-1
ii  libaccountsservice0                   0.6.45-1
ii  libaudit1                             1:2.7.8-1
ii  libc6                                 2.24-17
ii  libcanberra-gtk3-0                    0.30-3
ii  libcanberra0                          0.30-3
ii  libgdk-pixbuf2.0-0                    2.36.11-1
ii  libgdm1                               3.26.1-3
ii  libglib2.0-0                          2.54.1-1
ii  libglib2.0-bin                        2.54.1-1
ii  libgtk-3-0                            3.22.24-1
ii  libkeyutils1                          1.5.9-9
ii  libpam-modules                        1.1.8-3.6
ii  libpam-runtime                        1.1.8-3.6
ii  libpam-systemd                        234-3
ii  libpam0g                              1.1.8-3.6
ii  librsvg2-common                       2.40.18-1
ii  libselinux1                           2.7-2
ii  libsystemd0                           234-3
ii  libwrap0                              7.6.q-26
ii  libx11-6                              2:1.6.4-3
ii  libxau6                               1:1.0.8-1+b2
ii  libxcb1                               1.12-1
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              9.20170808
ii  mutter [x-window-manager]             3.22.4-2
ii  policykit-1                           0.105-18
ii  ucf                                   3.0036
ii  x11-common                            1:7.7+19
ii  x11-xserver-utils                     7.7+7+b1

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.26.0-2
ii  desktop-base    9.0.5
ii  x11-xkb-utils   7.7+3+b1
ii  xserver-xephyr  2:1.19.3-2
ii  xserver-xorg    1:7.7+19
ii  zenity          3.24.0-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.26.0-1
ii  libpam-gnome-keyring  3.20.1-1

-- Configuration Files:
/etc/gdm3/daemon.conf changed:
[daemon]
AutomaticLoginEnable=True
AutomaticLogin=jason
[security]
[xdmcp]
[chooser]
[debug]
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