LP#1494518 "segmentation fault when running with --test-socket option"

[bluesabre]

First reported on Launchpad at https://bugs.launchpad.net/ubuntu/+source/lightdm-gtk-greeter-settings/+bug/1494518

[github-actions]

LP#0: Lyn Perrine (walterorlin) wrote on 2015-09-10:

to reproduce run lightdm-gtk-greeter --test-socket or lightdm-gtk-greeter-pkexec test socket and you will get a segmentation fault asking you to authenticate the program seems to start but then has a segmentation fualt.

ightdm-gtk-greeter-settings::
Installed: 1.2.0-0ubuntu1
Candidate: 1.2.0-0ubuntu1
Version table:
*** 1.2.0-0ubuntu1 0
500 http://us.archive.ubuntu.com/ubuntu/ wily/universe i386 Packages
100 /var/lib/dpkg/status
Description: Ubuntu Wily Werewolf (development branch)
Release: 15.10

I expected this to not segmentation fualt and give a permission denid when running as regualr user or not perofmr a segmentaion fault when run as pkexec.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: lightdm-gtk-greeter-settings 1.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
Uname: Linux 4.2.0-7-generic i686
ApportVersion: 2.18.1-0ubuntu1
Architecture: i386
CurrentDesktop: LXDE
Date: Thu Sep 10 14:11:53 2015
ExecutablePath: /usr/bin/lightdm-gtk-greeter-settings
InstallationDate: Installed on 2015-09-10 (0 days ago)
InstallationMedia: Lubuntu 15.10 "Wily Werewolf" - Alpha i386 (20150910)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/lightdm-gtk-greeter-settings --test-socket
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: lightdm-gtk-greeter-settings
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[github-actions]

LP#1: Lyn Perrine (walterorlin) wrote on 2015-09-10:

Attachments:

• Dependencies.txt
• JournalErrors.txt
• ProcEnviron.txt
• ProcMaps.txt
• ProcStatus.txt

[github-actions]

LP#2: Apport retracing service (apport) wrote on 2015-09-10:

StacktraceTop:
gdk_x11_ref_cairo_surface (window=0x9baf8d8) at /build/gtk+3.0-2BkvjZ/gtk+3.0-3.16.6/./gdk/x11/gdkwindow-x11.c:485
gdk_window_ref_impl_surface (window=0x9baf8d8) at /build/gtk+3.0-2BkvjZ/gtk+3.0-3.16.6/./gdk/gdkwindow.c:2726
gdk_window_create_similar_image_surface (window=0x9baf8d8, format=CAIRO_FORMAT_ARGB32, width=16, height=16, scale=1) at /build/gtk+3.0-2BkvjZ/gtk+3.0-3.16.6/./gdk/gdkwindow.c:9577
gdk_cairo_surface_create_from_pixbuf (pixbuf=0x9c21120, scale=1, for_window=0x9baf8d8) at /build/gtk+3.0-2BkvjZ/gtk+3.0-3.16.6/./gdk/gdkcairo.c:299
get_surface_from_gicon (icon=icon@entry=0x9b0bcb0, widget=widget@entry=0x9a9b108, icon_size=16, error=0x0) at /build/gtk+3.0-2BkvjZ/gtk+3.0-3.16.6/./gtk/gtkfilesystem.c:739

[github-actions]

LP#3: Apport retracing service (apport) wrote on 2015-09-10:

Attachments:

• Stacktrace.txt

[github-actions]

LP#4: Apport retracing service (apport) wrote on 2015-09-10:

Attachments:

• StacktraceSource.txt

[github-actions]

LP#5: Apport retracing service (apport) wrote on 2015-09-10:

Attachments:

• ThreadStacktrace.txt

[github-actions]

LP#6: James Lu (tacocat) wrote on 2016-12-04:

I can confirm this locally: "lightdm-gtk-greeter-settings --test-socket" runs as non-root and shows a "Test embedded mode window", but the elements are quite flickery and the program segfaults on quit. That said, I'm not sure what the purpose of this option is, and whether it's supposed to be used by a regular user.