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

[Jean-Baptiste Lallement]

Test Case
1. In a live session, open system settings
2. Click on 'Users'

Expected result
The 'users' panel opens (even if I think the 'users' panel should not be there at all)

Actual result
This crash

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: gnome-control-center 1:3.24.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-22-generic x86_64
ApportVersion: 2.20.5-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Jun 7 10:37:41 2017
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2013-09-03 (1372 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902)
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: 0x55c78b9944f8 <um_carousel_select_item+104>: mov 0x48(%rsi),%eax
 PC (0x55c78b9944f8) ok
 source "0x48(%rsi)" (0x00000048) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
 um_carousel_select_item ()
 ()
 g_closure_invoke () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gnome-control-center crashed with SIGSEGV in um_carousel_select_item()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 um_carousel_select_item (self=0x55c78de65520, item=0x0) at um-carousel.c:212
 reload_users (d=0x55c78d8fc440, selected_user=0x55c78dbfaec0) at um-user-panel.c:299
 g_closure_invoke (closure=0x55c78e06b900, return_value=return_value@entry=0x0, n_param_values=2, param_values=param_values@entry=0x7ffdbce75730, invocation_hint=invocation_hint@entry=0x7ffdbce756b0) at ../../../../gobject/gclosure.c:804
 signal_emit_unlocked_R (node=node@entry=0x55c78e0204e0, detail=detail@entry=0, instance=instance@entry=0x55c78dbfadb0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffdbce75730) at ../../../../gobject/gsignal.c:3635
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7ffdbce758f0) at ../../../../gobject/gsignal.c:3391

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.