lightdm-gtk-greeter-team team mailing list archive

[Bela Lubkin <1677397@xxxxxxxxxxxxxxxxxx>]

Similar failure occurs with kylin-greeter.

Similar-seeming failure occurs with lightdm-webkit-greeter (at least a
segfault shows up in syslog) -- with the CRUCIAL difference that,
despite segfault, it actually allows me to login and do stuff over the
session!

syslog is also full of crashes of:

panel-5-indicator (and Xfce keeps asking me if I want to keep trying it,
or remove it from my config -- NEITHER, if it won't work in this
situation then stop trying to run it but leave it in the config for when
I'm on a local display...!)

/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
/usr/lib/update-notifier/system-crash-notification
/usr/lib/x86_64-linux-gnu/xfce4/panel/wrapper-2.0 (equals panel-5-indicator)
/usr/share/apport/apport-gtk

-- 
You received this bug notification because you are a member of LightDM
Gtk+ Greeter Development Team, which is subscribed to lightdm-gtk-
greeter in Ubuntu.
https://bugs.launchpad.net/bugs/1677397

Title:
  lightdm-gtk-greeter SIGSEGV when invoked by Xvnc -inetd -query

Status in lightdm-gtk-greeter package in Ubuntu:
  New

Bug description:
  To reproduce:

  1. Install Xubuntu 16.04 LTS, update fully

  2. Install packages xinetd, vnc4server

  3. Append to /etc/services:

  vnc             5900/tcp                        # VNC Virtual Network
  Computing

  4. Append to /etc/lightdm/lightdm.conf:

  [XDMCPServer]
  enabled=true

  5. Create /etc/xinetd.d/vnc:

  service vnc
  {
          disable         = no
          socket_type     = stream
          protocol        = tcp
          group           = tty
          wait            = no
          user            = nobody
          server          = /usr/bin/Xvnc
          server_args     = -inetd -query localhost -once -securitytypes=none -geometry 1024x768
  }
  # NOTE: might need to add an arg like ":1" to get out of way of local X server
  # my case is special as I am trying to run headless, nobody is logged in on console

  6. Signal xinetd and lightdm to reconfigure:

  $ sudo killall -1 xinetd
  $ sudo service lightdm restart      # or however your init system works

  7. Don't know if significant (I am 400 miles away from test host and can't test):
  do NOT have anyone logged in on the test host console.  In fact, to most closely
  reproduce my case, shut down the test host, power it off, disconnect all monitors
  and keyboards, then power it on and access from the net.

  8. From another system, connect to the test host:

  $ gvncviewer testhost:0   # Your favorite VNC viewer & test host
  name...

  9. VNC connects briefly, displays grey hashed background, disconnects.  Syslog on
  test host says:

  Mar 29 15:07:40 osmium lightdm[13828]: (lightdm:13828): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
  Mar 29 15:07:40 osmium systemd[1]: Started Session c11 of user lightdm.
  Mar 29 15:07:40 osmium lightdm[13828]: ** (lightdm:13828): WARNING **: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
  Mar 29 15:07:40 osmium kernel: [14985.100699] lightdm-gtk-gre[13972]: segfault at 0 ip 00007f3f23bd09bf sp 00007ffc64b32058 error 4 in libc-2.23.so[7f3f23b3b000+1bf000]
  Mar 29 15:07:41 osmium lightdm[13828]: /etc/modprobe.d is not a file
  Mar 29 15:07:41 osmium lightdm[13828]: message repeated 4 times: [ /etc/modprobe.d is not a file]
  Mar 29 15:07:41 osmium lightdm[13828]: update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf

  and core-like-thing ends up in /var/crash/...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-70.91-generic 4.4.49
  Uname: Linux 4.4.0-70-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Mar 29 14:52:52 2017
  InstallationDate: Installed on 2017-03-28 (1 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  ProcEnviron:
   TERM=xterm
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   XDG_RUNTIME_DIR=<set>
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: No upgrade log present (probably fresh install)

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