gpaste-daemon crashed with SIGSEGV in g_type_check_instance_is_fundamentally_a() from g_object_unref() from gtk_css_value_image_free()

[Nathaniel Beaver]

I do not have a method to reproduce this bug at this time.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: gpaste 3.28.0-2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Jun 2 09:47:22 2018
ExecutablePath: /usr/lib/x86_64-linux-gnu/gpaste/gpaste-daemon
InstallationDate: Installed on 2018-04-27 (35 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcCmdline: /usr/lib/x86_64-linux-gnu/gpaste/gpaste-daemon
ProcEnviron:
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
 PATH=(custom, user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
SegvAnalysis:
 Segfault happened at: 0x7f605ceb9c0f <g_type_check_instance_is_fundamentally_a+15>: mov (%rdx),%rdx
 PC (0x7f605ceb9c0f) ok
 source "(%rdx)" (0x700000008) not located in a known VMA region (needed readable region)!
 destination "%rdx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gpaste
StacktraceTop:
 g_type_check_instance_is_fundamentally_a (type_instance=type_instance@entry=0x56380b81db00, fundamental_type=fundamental_type@entry=80) at ../../../../gobject/gtype.c:4025
 g_object_unref (_object=0x56380b81db00) at ../../../../gobject/gobject.c:3237
 gtk_css_value_image_free (value=0x56380b828860) at ../../../../gtk/gtkcssimagevalue.c:32
 gtk_css_static_style_dispose (object=0x56380ac1fce0 [GtkCssStaticStyle]) at ../../../../gtk/gtkcssstaticstyle.c:81
 g_object_unref (_object=0x56380ac1fce0) at ../../../../gobject/gobject.c:3303
Title: gpaste-daemon crashed with SIGSEGV in g_type_check_instance_is_fundamentally_a()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio bluetooth cdrom dialout dip floppy lpadmin netdev plugdev sambashare scanner sudo systemd-journal tty vboxusers video wireshark

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_is_fundamentally_a (type_instance=type_instance@entry=0x56380b81db00, fundamental_type=fundamental_type@entry=80) at ../../../../gobject/gtype.c:4025
 g_object_unref (_object=0x56380b81db00) at ../../../../gobject/gobject.c:3237
 gtk_css_value_image_free (value=0x56380b828860) at ../../../../gtk/gtkcssimagevalue.c:32
 gtk_css_static_style_dispose (object=0x56380ac1fce0) at ../../../../gtk/gtkcssstaticstyle.c:81
 g_object_unref (_object=0x56380ac1fce0) at ../../../../gobject/gobject.c:3303

[Launchpad Janitor (janitor)]

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