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Bug#934105: xfdesktop4: xfdesktop crashes and coredump when upgrading

Package: xfdesktop4
Version: 4.12.4-2
Severity: important

Dear Maintainer,

* What led up to the situation?

It's been some time that I experienced coredumps of xfdesktop and xfce4-panel
when upgrading.

* What exactly did you do (or not do) that was effective (or ineffective)?

Using sid, I usually run apt update and upgrade daily to keep system up-to-
date. But I've noticed that when upgrading is running, seems like usually when
post-install phases, desktop wallpaper and xfce4-panel flash and disappear and
then appear again. I first thought they were restarting due to some upgrade
packages related to them. But later I found they were indeed xfdesktop and
xfce4-panel crashes and I saw coredump files saved, weird thing is that this
happens even when the packages upgrading are not related to the desktop itself.
For example, today I only got google-chrome-stable updated and both xfdesktop
and xfce4-panel crashed and coredumped.

Below is what I got from journalctl -xe when xfdesktop crashed during google-
chrome-stable upgrade.

Aug 07 09:53:11 MyDebian systemd-coredump[5406]: Process 5159 (xfdesktop) of
user 1000 dumped core.

                                                 Stack trace of thread 5159:
                                                 #0  0x00007fc31ce4975a
g_slice_alloc (libglib-2.0.so.0)
                                                 #1  0x00007fc31ce27316
g_list_prepend (libglib-2.0.so.0)
                                                 #2  0x00007fc31daf4b87 n/a
                                                 #3  0x00007fc31daf5b44 n/a
                                                 #4  0x00007fc31ce2b898
g_main_context_dispatch (libglib-2.0.so.0)
                                                 #5  0x00007fc31ce2bc88 n/a
                                                 #6  0x00007fc31ce2bf82
g_main_loop_run (libglib-2.0.so.0)
                                                 #7  0x00007fc31d75d8e7
gtk_main (libgtk-x11-2.0.so.0)
                                                 #8  0x000055a665e6fc6c n/a
                                                 #9  0x000055a665e700a6 n/a
                                                 #10 0x00007fc31ce28263 n/a
                                                 #11 0x00007fc31ce28c9e n/a
                                                 #12 0x00007fc31ce2b928
g_main_context_dispatch (libglib-2.0.so.0)
                                                 #13 0x00007fc31ce2bc88 n/a
                                                 #14 0x00007fc31ce2bd1c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #15 0x00007fc31d0aca0d
g_application_run (libgio-2.0.so.0)
                                                 #16 0x000055a665e64fad main
                                                 #17 0x00007fc31cc1f09b
__libc_start_main (libc.so.6)
                                                 #18 0x000055a665e64fea _start

                                                 Stack trace of thread 5162:
                                                 #0  0x00007fc31cce9819 __poll
                                                 #1  0x00007fc31ce2bbf6 n/a
                                                 #2  0x00007fc31ce2bd1c
g_main_context_iteration (libglib-2.0.so.0)
                                                 #3  0x00007fc31ce2bd61 n/a
                                                 #4  0x00007fc31ce5489d n/a
                                                 #5  0x00007fc31cdc3fa3
start_thread (libpthread.so.0)
                                                 #6  0x00007fc31ccf44cf __clone

                                                 Stack trace of thread 5163:
                                                 #0  0x00007fc31cce9819 __poll
                                                 #1  0x00007fc31ce2bbf6 n/a
                                                 #2  0x00007fc31ce2bf82
g_main_loop_run (libglib-2.0.so.0)
                                                 #3  0x00007fc31d0e6e46 n/a
                                                 #4  0x00007fc31ce5489d n/a
                                                 #5  0x00007fc31cdc3fa3
start_thread (libpthread.so.0)
                                                 #6  0x00007fc31ccf44cf __clone
-- Subject: Process 5159 (xfdesktop) dumped core
-- Defined-By: systemd
-- Support: https://www.debian.org/support
-- Documentation: man:core(5)
-- Process 5159 (xfdesktop) crashed and dumped core.
-- This usually indicates a programming error in the crashing program and
-- should be reported to its vendor as a bug.
Aug 07 09:53:11 MyDebian systemd[1]: systemd-coredump@9-5351-0.service:
-- Subject: Unit succeeded

I don't know how to backtrace so this is pretty much I can get now.

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xfdesktop4 depends on:
ii  exo-utils            0.12.6-1
ii  libc6                2.28-10
ii  libcairo2            1.16.0-4
ii  libdbus-1-3          1.12.16-1
ii  libdbus-glib-1-2     0.110-4
ii  libexo-1-0           0.12.6-1
ii  libgarcon-1-0        0.6.3-1
ii  libgdk-pixbuf2.0-0   2.38.1+dfsg-1
ii  libglib2.0-0         2.60.6-1
ii  libgtk2.0-0          2.24.32-3
ii  libnotify4           0.7.7-4
ii  libpango-1.0-0       1.42.4-7
ii  libpangocairo-1.0-0  1.42.4-7
ii  libwnck22            2.30.7-6
ii  libx11-6             2:1.6.7-1
ii  libxfce4ui-1-0       4.12.1-3
ii  libxfce4util7        4.12.1-3
ii  libxfconf-0-2        4.12.1-1+b1
ii  xfdesktop4-data      4.12.4-2

Versions of packages xfdesktop4 recommends:
ii  dbus-user-session [default-dbus-session-bus]  1.12.16-1
ii  dbus-x11 [dbus-session-bus]                   1.12.16-1
ii  librsvg2-common                               2.44.10-2.1
ii  tumbler                                       0.2.4-1
ii  xdg-user-dirs                                 0.17-2

Versions of packages xfdesktop4 suggests:
pn  menu  <none>

-- no debconf information

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