[Pkg-xfce-devel] Bug#762211: lightdm crashes on startup, system falls back to console

Fabio Rosciano malmostoso at gmail.com
Fri Sep 19 14:37:38 UTC 2014

Package: lightdm
Version: 1.10.2-1
Severity: critical
Justification: breaks the whole system


I cannot start lightdm on my system with Intel graphics since yesterday's
upgrade from 1.10.1-3 to 1.10.2-1.
The service fails with:

root at nostromo:~# systemctl start lightdm
Job for lightdm.service failed. See 'systemctl status lightdm.service' and
'journalctl -xn' for details.
root at nostromo:~# systemctl status lightdm.service
● lightdm.service - Light Display Manager
   Loaded: loaded (/lib/systemd/system/lightdm.service; enabled)
   Active: failed (Result: start-limit) since Fri 2014-09-19 16:31:21 CEST;
1s ago
     Docs: man:lightdm(1)
  Process: 4253 ExecStartPre=/bin/sh -c [ "$(cat
/etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/lightdm" ]
(code=exited, status=1/FAILURE)

Sep 19 16:31:21 nostromo systemd[1]: Unit lightdm.service entered failed
Sep 19 16:31:21 nostromo systemd[1]: lightdm.service start request repeated
too quickly, refusing to start.
Sep 19 16:31:21 nostromo systemd[1]: Failed to start Light Display Manager.
Sep 19 16:31:21 nostromo systemd[1]: Unit lightdm.service entered failed

And invoking lightdm directly yields:

root at nostromo:~# lightdm
*** Error in `lightdm': double free or corruption (fasttop):
*** 0x00007f51a9ea1850 ***

Please let me know how can I help debugging.
I have installed xdm as a workaround and the system boots and works fine.
Thank you!

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages lightdm depends on:
ii  adduser                                3.113+nmu3
ii  consolekit                             0.4.6-5
ii  dbus                                   1.8.8-1
ii  debconf [debconf-2.0]                  1.5.53
ii  libc6                                  2.19-11
ii  libgcrypt11                            1.5.4-3
ii  libglib2.0-0                           2.40.0-5
ii  libpam-systemd                         215-4
ii  libpam0g                               1.1.8-3.1
ii  libxcb1                                1.10-3
ii  libxdmcp6                              1:1.1.1-1
ii  lightdm-gtk-greeter [lightdm-greeter]  1.8.5-1

Versions of packages lightdm recommends:
ii  xserver-xorg  1:7.7+7

Versions of packages lightdm suggests:
ii  accountsservice  0.6.37-3
ii  upower           0.99.1-3

-- Configuration Files:
/etc/lightdm/lightdm.conf changed:

-- debconf information:
  lightdm/daemon_name: /usr/sbin/lightdm
* shared/default-x-display-manager: xdm

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