gnome-control-center crashed with SIGSEGV in g_type_check_instance_cast()

[Michal Pasniewski]

Crash when changing docking or monitor settings. I have 3 identical monitors and I am trying to order them properly (horizontally).

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.26.1-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 27 19:38:18 2017
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2017-10-27 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
ProcCmdline: gnome-control-center --overview
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fce64b5bde2 <g_type_check_instance_cast+34>: mov (%rdi),%rbp
 PC (0x7fce64b5bde2) ok
 source "(%rdi)" (0x6000e2c49100080) not located in a known VMA region (needed readable region)!
 destination "%rbp" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
 g_type_check_instance_cast () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? ()
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gnome-control-center crashed with SIGSEGV in g_type_check_instance_cast()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x556f547c8790, iface_type=93936654741120) at ../../../../gobject/gtype.c:4057
 ext_ubuntu_dock_placement_changed_callback (settings=<optimized out>, key=<optimized out>, user_data=<optimized out>) at cc-ubuntu-panel.c:258
 g_closure_invoke (closure=0x556f54703100, return_value=0x0, n_param_values=2, param_values=0x7ffd9dcc9c60, invocation_hint=0x7ffd9dcc9be0) at ../../../../gobject/gclosure.c:804
 signal_emit_unlocked_R (node=node@entry=0x556f53f95a00, detail=detail@entry=4427, instance=instance@entry=0x556f544e7700, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffd9dcc9c60) at ../../../../gobject/gsignal.c:3635
 g_signal_emit_valist (instance=0x556f544e7700, signal_id=<optimized out>, detail=4427, var_args=var_args@entry=0x7ffd9dcc9e30) at ../../../../gobject/gsignal.c:3391

[Sebastien Bacher (seb128)]

The issue has been fixed in that upate
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/1:3.26.1-0ubuntu5