Application: plasmashell (5.20.5)

Qt Version: 5.15.2
Frameworks Version: 5.78.0
Operating System: Linux 5.10.11-arch1-1 x86_64
Windowing system: X11
Distribution: Arch Linux

-- Information about the crash:
- What I was doing when the application crashed: I had just finished setting up my desktop.  I then rebooted.

- Unusual behavior I noticed: After reboot the desktop would only show wallpaper.   I could not do anything.  Even using shortcut to terminal would not show it.  I was finally able to add application launcher widget to desktop.   Then I was able to launch system settings, restore global theme completely to Breeze.   At that point it was back to where I could use the pc as normal.  Unfortunately, 

- Custom settings of the application:

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f23186e7280 in Plasma::Applet::immutability() const () at /usr/lib/libKF5Plasma.so.5
#5  0x00007f23186e735a in Plasma::Applet::destroy() () at /usr/lib/libKF5Plasma.so.5
#6  0x00007f23081b755a in  () at /usr/lib/qt/plugins/plasma/applets/org.kde.plasma.systemtray.so
#7  0x00007f23081b7579 in  () at /usr/lib/qt/plugins/plasma/applets/org.kde.plasma.systemtray.so
#8  0x00007f23168d910e in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#9  0x00007f23168e3f75 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#10 0x00007f23186eb24a in Plasma::Containment::~Containment() () at /usr/lib/libKF5Plasma.so.5
#11 0x00007f23168db340 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f231754a752 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f23168aea7a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#14 0x00007f23168b1573 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f23169080a4 in  () at /usr/lib/libQt5Core.so.5
#16 0x00007f2314c96a84 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#17 0x00007f2314cea9b1 in  () at /usr/lib/libglib-2.0.so.0
#18 0x00007f2314c952b1 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#19 0x00007f23169076e1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#20 0x00007f23168ad3fc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#21 0x00007f23168b5894 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#22 0x0000560421976069 in  ()
#23 0x00007f2316279152 in __libc_start_main () at /usr/lib/libc.so.6
#24 0x00005604219762ae in  ()
[Inferior 1 (process 552) detached]

Possible duplicates by query: bug 428554, bug 427593, bug 426926, bug 425444, bug 422129.

Reported using DrKonqi