Application: systemsettings5 (5.21.5)

Qt Version: 5.15.2
Frameworks Version: 5.82.0
Operating System: Linux 5.12.11-300.fc34.x86_64 x86_64
Windowing System: Wayland
Drkonqi Version: 5.21.5
Distribution: "Fedora release 34 (Thirty Four)"

-- Information about the crash:
- What I was doing when the application crashed:

I changed the following config and click "Apply" button, then crash:
Appearance, Window Decorations, Window border size: value change from "No borders" to "Theme default".

The config is saved as it retained after reopen System Settings.

Redo the former steps, and the crash doesn't appear again.

The crash does not seem to be reproducible.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f7f347c0b80 in ?? ()
#5  0x00007f7fc759ef37 in QWaylandClientExtensionPrivate::handleRegistryGlobal(void*, wl_registry*, unsigned int, QString const&, unsigned int) () from /lib64/libQt5WaylandClient.so.5
#6  0x00007f7fc758b419 in QtWaylandClient::QWaylandDisplay::registry_global(unsigned int, QString const&, unsigned int) () from /lib64/libQt5WaylandClient.so.5
#7  0x00007f7fc75a77c3 in QtWayland::wl_registry::handle_global(void*, wl_registry*, unsigned int, char const*, unsigned int) () from /lib64/libQt5WaylandClient.so.5
#8  0x00007f7fc4f38c04 in ffi_call_unix64 () from /lib64/libffi.so.6
#9  0x00007f7fc4f38107 in ffi_call () from /lib64/libffi.so.6
#10 0x00007f7fc74f8d10 in wl_closure_invoke.constprop () from /lib64/libwayland-client.so.0
#11 0x00007f7fc74f942b in dispatch_event.isra () from /lib64/libwayland-client.so.0
#12 0x00007f7fc74f961c in wl_display_dispatch_queue_pending () from /lib64/libwayland-client.so.0
#13 0x00007f7fc75837a3 in QtWaylandClient::QWaylandDisplay::flushRequests() () from /lib64/libQt5WaylandClient.so.5
#14 0x00007f7fc99114fd in void doActivate<false>(QObject*, int, void**) () from /lib64/libQt5Core.so.5
#15 0x00007f7fc9913b3a in QSocketNotifier::activated(QSocketDescriptor, QSocketNotifier::Type, QSocketNotifier::QPrivateSignal) () from /lib64/libQt5Core.so.5
#16 0x00007f7fc99142d4 in QSocketNotifier::event(QEvent*) () from /lib64/libQt5Core.so.5
#17 0x00007f7fca46be73 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#18 0x00007f7fc98e0f48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#19 0x00007f7fc992e17f in socketNotifierSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#20 0x00007f7fc769f4cf in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#21 0x00007f7fc76f34e8 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#22 0x00007f7fc769cc03 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#23 0x00007f7fc992d6f8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#24 0x00007f7fc98df9b2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#25 0x00007f7fc98e7544 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#26 0x000055cd87864d4c in main ()
[Inferior 1 (process 13881) detached]

Reported using DrKonqi