Created attachment 155755 [details]
The footage of the bug

Application: systemsettings (5.24.4)

Qt Version: 5.15.2
Frameworks Version: 5.90.0
Operating System: Linux 5.14.21-150400.24.41-default x86_64
Windowing System: X11
Distribution: "openSUSE Leap 15.4"
DrKonqi: 5.24.4 [KCrashBackend]

-- Information about the crash:
- What I was doing when the application crashed:
I was increasing the rows of a virtual desktop from the settings
Then I pressed ctrl+f8 to view virtual desktops after I prssed the '+' icon the settings crashed and the rows were not created.

The crash can be reproduced every time.

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

[KCrash Handler]
#4  std::__atomic_base<int>::load (__m=std::memory_order_relaxed, this=<optimized out>) at /usr/include/c++/10/bits/atomic_base.h:420
#5  QAtomicOps<int>::loadRelaxed<int> (_q_value=...) at /usr/include/qt5/QtCore/qatomic_cxx11.h:239
#6  QBasicAtomicInteger<int>::loadRelaxed (this=<optimized out>) at /usr/include/qt5/QtCore/qbasicatomic.h:107
#7  QtPrivate::RefCount::ref (this=<optimized out>) at /usr/include/qt5/QtCore/qrefcount.h:55
#8  QString::QString (other=..., this=0x7ffecd75e138) at /usr/include/qt5/QtCore/qstring.h:1094
#9  KWin::DesktopsModel::desktopCreated (this=0x55b63ad20240, id=..., data=...) at /usr/src/debug/kwin5-5.24.4-bp154.1.33.x86_64/src/kcmkwin/kwindesktop/desktopsmodel.cpp:542
#10 0x00007fe30ac9a1a3 in KWin::DesktopsModel::qt_metacall (this=0x55b63ad20240, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7ffecd75e2c0) at /usr/src/debug/kwin5-5.24.4-bp154.1.33.x86_64/build/src/kcmkwin/kwindesktop/kcm_kwin_virtualdesktops_autogen/EWIEGA46WW/moc_desktopsmodel.cpp:334
#11 0x00007fe34e8c13e8 in QDBusConnectionPrivate::deliverCall (this=<optimized out>, object=<optimized out>, msg=..., metaTypes=..., slotIdx=<optimized out>) at qdbusintegrator.cpp:1001
#12 0x00007fe35170dd9b in QObject::event (this=0x55b63ad20240, e=0x7fe33000cb90) at kernel/qobject.cpp:1314
#13 0x00007fe352ba93bc in QApplicationPrivate::notify_helper (this=this@entry=0x55b63a2eca90, receiver=receiver@entry=0x55b63ad20240, e=e@entry=0x7fe33000cb90) at kernel/qapplication.cpp:3632
#14 0x00007fe352bb01a0 in QApplication::notify (this=0x7ffecd75e9f0, receiver=0x55b63ad20240, e=0x7fe33000cb90) at kernel/qapplication.cpp:3156
#15 0x00007fe3516d9c23 in QCoreApplication::notifyInternal2 (receiver=0x55b63ad20240, event=0x7fe33000cb90) at kernel/qcoreapplication.cpp:1064
#16 0x00007fe3516d9dfe in QCoreApplication::sendEvent (receiver=receiver@entry=0x55b63ad20240, event=event@entry=0x7fe33000cb90) at kernel/qcoreapplication.cpp:1462
#17 0x00007fe3516dc641 in QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55b63a2d9480) at kernel/qcoreapplication.cpp:1821
#18 0x00007fe3516dcbc8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1680
#19 0x00007fe35173c983 in postEventSourceDispatch (s=0x55b63a3c43c0) at kernel/qeventdispatcher_glib.cpp:277
#20 0x00007fe34a25482b in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#21 0x00007fe34a254bd0 in ?? () from /usr/lib64/libglib-2.0.so.0
#22 0x00007fe34a254c5c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#23 0x00007fe35173c02c in QEventDispatcherGlib::processEvents (this=0x55b63a3cfe90, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#24 0x00007fe3516d848a in QEventLoop::exec (this=this@entry=0x7ffecd75e8d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:232
#25 0x00007fe3516e1cc7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1375
#26 0x000055b63900da3e in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/systemsettings5-5.24.4-bp154.1.23.x86_64/app/main.cpp:183
[Inferior 1 (process 10427) detached]