xfce4-settings-manager crashed with SIGSEGV in gtk_drag_finish()

[Spass]

I was changing some options in the Window Manager settings (xfwm4 4.13.1). It started behaving strangely - when I clicked somewhere in the Window Manager settings window it brought me back to the main settings window, I clicked on Window Manager icon, WM settings window showed up and the crash report opened.

ProblemType: Crash
DistroRelease: Ubuntu 18.10
Package: xfce4-settings 4.13.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.17.0-6.7-generic 4.17.9
Uname: Linux 4.17.0-6-generic x86_64
ApportVersion: 2.20.10-0ubuntu7
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Aug 3 00:59:43 2018
ExecutablePath: /usr/bin/xfce4-settings-manager
InstallationDate: Installed on 2018-08-01 (1 days ago)
InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180801)
ProcCmdline: xfce4-settings-manager
SegvAnalysis:
 Segfault happened at: 0x7f088d2db1ed <gtk_drag_finish+29>: mov (%rbx),%rdx
 PC (0x7f088d2db1ed) ok
 source "(%rbx)" (0x00000008) not located in a known VMA region (needed readable region)!
 destination "%rdx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xfce4-settings
StacktraceTop:
 gtk_drag_finish () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: xfce4-settings-manager crashed with SIGSEGV in gtk_drag_finish()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 gtk_drag_finish (context=0x8, success=0, del=0, time=6) at ../../../../gtk/gtkdnd.c:961
 gtk_drag_drop_finished (info=0x560a3ecfbd60, result=result@entry=GTK_DRAG_RESULT_TIMEOUT_EXPIRED, time=<optimized out>) at ../../../../gtk/gtkdnd.c:2593
 gtk_drag_abort_timeout (data=<optimized out>) at ../../../../gtk/gtkdnd.c:3265
 gdk_threads_dispatch (data=0x560a3ea53f20, data@entry=<error reading variable: value has been optimized out>) at ../../../../gdk/gdk.c:755
 g_timeout_dispatch (source=source@entry=0x560a3ecdeac0, callback=<optimized out>, user_data=<optimized out>) at ../../../../glib/gmain.c:4650

[Spass (spass)]

Created attachment 7885
terminal output

Hello, I'm testing Xubuntu 18.10 with xfwm4 4.13.1 installed in VirtualBox VM. I have an issue with xfwm4-settings (opened separately and within the xfce4-settings-manager) window crashing when I change the button layout, just by dragging it's elements.

There are some issues with "gtk_widget_size_allocate" and most important:
xfwm4-settings: ../../../../src/cairo-surface.c:1734: cairo_surface_mark_dirty_rectangle: Assertion `! _cairo_surface_has_mime_data (surface)' failed.
(full terminal output attached)

Besides the window closing/crashing, when I open Window Manager settings from Settings Manager (and only then) and when I change the button layout, the buttons are disappearing from that section (see here - https://ibb.co/mXtPBU ). Probably related to "gtk_widget_size_allocate".

[Spass (spass)]

Also, this is my Launchpad bug report related to this issue, maybe it will be useful:
https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1785143

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1785143

[Launchpad Janitor (janitor)]

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

[Chris Guiver (guiverc)]

Ubuntu-Studio 19.04 QA-Test (live)

I didn't note any strange behavior (I'd left the room briefly and came back to this)

I was just using xfce4-settings-manager just prior to leaving the room, and had just changed my window dressing (button layout change then style to another choice [moheli]).

[Spass (spass)]

I have the same issue on Xubuntu 19.04 Disco Dingo with some development PPAs.

xfce4-settings:
  Installed: 4.13.4-1ubuntu2

[Spass (spass)]

I'm on Xubuntu 19.04 Disco Dingo now and I still have this issue with Window Manager settings window. It doesn't always crash, but the issue with disappearing buttons when changing the layout is all the time, easy to reproduce.

xfwm4 4.13.1-3~19.04, VirtualBox VM

Bug reports from Launchpad related to this issue:
https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1821638
https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1821517

[Chris Guiver (guiverc)]

I tested today using Xubuntu 19.04 daily (20190325) and could NOT re-create this issue.
dell [optiplex] 755 (c2d-e8300, 8gb, amd/ati radeon rv610/radeon hd2400 pro/xt)

--
comment #10 was I believe build 20190322, and on box
dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)
taken from http://iso.qa.ubuntu.com/qatracker/milestones/398/builds/190037/testcases/1303/results

[Gitbot (gitbot)]

Olivier Fourdan referenced this bugreport in commit 60a8e49c8a63db47b8eb31618e0b6aa5be729a80

settings: Crash in button layout

https://git.xfce.org/xfce/xfwm4/commit?id=60a8e49c8a63db47b8eb31618e0b6aa5be729a80

[Chris Guiver (guiverc)]

Xubuntu 19.10 qa-testing (2019-05-10 iso date in /etc/apt/sources.list)

on boxes
dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)
dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

I'd open window-manager-settings to change the close/minimize/maximize buttons from right to left, the first would move then crash... I'd re-open window-manager-settings, one would move then crash...

On the d755 machine, I opened xfwm4-settings from terminal & ran from terminal and the following is what I'd see (note: this was not copy/pasted, but typed into another box)

xfwm4-settings: ../../../../src/cairo-surace.c:1734: cairo_surface_mark_dirty_rectangle: Assertion '! _cairo_surface_mime_data (surface)' failed. \n Aborted (core dumped)
recording detail on https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1785143

[Coya DeBrojara (coyadebrojara)]

This looks like a copy of the bug #1785143, but it appeared while trying to launch the program originally intended for ubuntu 14.04. The program is: "prime-indicator_0.1-1+git20150211~webupd8~1_all". The program itself works correctly, however, when trying to change the graphics card from Intel to nvidia, the above error appears. The error does not directly affect the Ubuntu package, but affects the functioning of the whole.
Interestingly, the program allowed the graphics card to switch correctly, so it works correctly.

Dell Inspiron7000 series, i7-7700HQ (intel HD graf. 630 and Nvidia GF1050TI), 32GB RAM.
Xubuntu 19.10 dev. branch, ISO 04 okt. 2019, updates of 05 okt. 2019.

[Sean Davis (bluesabre)]

Resolved upstream: https://bugzilla.xfce.org/show_bug.cgi?id=14606#c3