[Pkg-xfce-devel] Bug#862389: lightdm: X gets locked up after several switches to VT

Łukasz Stelmach l.stelmach at samsung.com
Fri May 12 07:54:42 UTC 2017

Package: lightdm
Version: 1.10.3-3
Severity: normal

Dear Maintainer,

After I had switched from X to VT several times (maybe there are other
cuases too, but I don't know them) X stopped updating windows. The mouse
cursor was moving and changing its shape as I moved it over different
windows. I could still switch betwen VT and X. On VT I found that,
apparently, lightdm wan't handling data from X properly because there
was over 200kB worth of data waiting in X's send queue and 8k in receive
queue in lightdm.

--8<---------------cut here---------------start------------->8---
Netid  State  Recv-Q Send-Q  Local Address:Port          Peer Address:Port   
u_str  ESTAB  0      213504  @/tmp/.X11-unix/X0 9689907  * 9691709 users:(("Xorg",pid=11405,fd=18))
u_str  ESTAB  8896   0                        * 9691709  * 9689907 users:(("lightdm",pid=10124,fd=11))
--8<---------------cut here---------------end--------------->8---

The numbers had been growing each time I switched between X and VT.

I had reported[1] this problem to the lighdm mailing list but there was no

[1] https://lists.freedesktop.org/archives/lightdm/2017-March/001056.html

-- System Information:
Debian Release: 8.8
  APT prefers stable-updates
  APT policy: (950, 'stable-updates'), (950, 'stable'), (500, 'proposed-updates')
Architecture: amd64 (x86_64)
Foreign Architectures: armel, arm64

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages lightdm depends on:
ii  adduser                                3.113+nmu3
ii  consolekit                             0.4.6-5
ii  dbus                                   1.8.22-0+deb8u1
ii  debconf [debconf-2.0]                  1.5.56
ii  libc6                                  2.19-18+deb8u9
ii  libgcrypt20                            1.6.3-2+deb8u2
ii  libglib2.0-0                           2.42.1-1+b1
ii  libpam-systemd                         215-17+deb8u7
ii  libpam0g                               1.1.8-3.1+deb8u2
ii  libxcb1                                1.10-3+b1
ii  libxdmcp6                              1:1.1.1-1+b1
ii  lightdm-gtk-greeter [lightdm-greeter]  1.8.5-2

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

Versions of packages lightdm suggests:
ii  accountsservice  0.6.37-3+b1
ii  upower           0.99.1-3.2

-- Configuration Files:
/etc/apparmor.d/lightdm-guest-session 9d3af5806375ac868fcaf5aaf3d56a00 [Errno 2] Nie ma takiego pliku ani katalogu: u'/etc/apparmor.d/lightdm-guest-session 9d3af5806375ac868fcaf5aaf3d56a00'
/etc/init/lightdm.conf b5de8ae57f7a4f102b6a6943139957a5 [Errno 2] Nie ma takiego pliku ani katalogu: u'/etc/init/lightdm.conf b5de8ae57f7a4f102b6a6943139957a5'

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

Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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