apport-gtk crashed with SIGSEGV in _gtk_settings_get_screen()

[rajesh]

apport-gtk crashed with SIGSEGV in g_type_create_instance() On login to unity session this error report was generated

Steps to reproduce
------------------

1. Use GNOME with GNOME shell
2. killall -11 gnome-shell

Suspicious Apport log:

gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

Error tracker
-------------

https://errors.ubuntu.com/problem/815a179408135a894bbb5921adef3757563c75c5

ProblemType: Crash
DistroRelease: Ubuntu 21.10
Package: apport-gtk 2.20.11-0ubuntu69
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME
Date: Sun Sep 26 21:35:23 2021
ExecutablePath: /usr/share/apport/apport-gtk
InstallationDate: Installed on 2021-09-26 (0 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Beta amd64 (20210924)
InterpreterPath: /usr/bin/python3.9
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/share/apport/apport-gtk
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.9, Python 3.9.7, python3-minimal, 3.9.4-1
PythonDetails: N/A
SegvAnalysis:
 Segfault happened at: 0x7fec34a2fb44: mov 0x18(%rax),%rax
 PC (0x7fec34a2fb44) ok
 source "0x18(%rax)" (0x00000018) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: apport
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
 g_type_create_instance () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: apport-gtk crashed with SIGSEGV in g_type_create_instance()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
separator:

[Apport retracing service (apport)]

StacktraceTop:
 _gtk_settings_get_screen (settings=<optimized out>, settings=<optimized out>) at ../../../../gtk/gtksettings.c:3358
 gtk_css_value_icon_theme_compute (icon_theme=<optimized out>, property_id=<optimized out>, provider=<optimized out>, style=<optimized out>, parent_style=<optimized out>) at ../../../../gtk/gtkcssiconthemevalue.c:84
 _gtk_css_value_compute (parent_style=0x0, style=0x23c6320, provider=0x0, property_id=3, value=0x7fec350c5be0 <inherit.lto_priv>) at ../../../../gtk/gtkcssvalue.c:97
 gtk_css_static_style_compute_value (section=0x0, specified=0x7fec350c5be0 <inherit.lto_priv>, id=3, parent_style=0x0, provider=0x0, style=0x23c6320) at ../../../../gtk/gtkcssstaticstyle.c:237
 _gtk_css_lookup_resolve (parent_style=0x0, style=0x23c6320, provider=0x0, lookup=0x23c53c0) at ../../../../gtk/gtkcsslookup.c:122

[Launchpad Janitor (janitor)]

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