Application: plasmashell (5.19.5)

Qt Version: 5.15.1
Frameworks Version: 5.73.0
Operating System: Linux 5.8.16-300.fc33.x86_64 x86_64
Windowing system: X11
Distribution: "Fedora release 33 (Thirty Three)"

-- Information about the crash:
- What I was doing when the application crashed:
Typing any word in the start menu, it crashes after the 2nd character

- Unusual behavior I noticed:
I just upgraded from Fedora 32 to Fedora 33, and I start having those persistent issues:

1. Krunner crash plasma when typing any alphabetic character - I workaround it by disabling the "Desktop sessions" plugin

2. Plasma keep crashing when ever I select the "leave" menu tab in the start menu

3. When ever the screen is locked I'm getting the message you need to "loginctl unlock-session <nn>" to unlock the screen

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

[KCrash Handler]
#4  0x00007f32c0d8efcc in __strchr_avx2 () at /lib64/libc.so.6
#5  0x00007f32c2fc48ee in strchr (__c=58, __s=0x0) at /usr/include/string.h:225
#6  KDisplayManager::KDisplayManager() (this=0x558bfd5f9210, this=<optimized out>) at /usr/src/debug/plasma-workspace-5.19.5-3.fc33.x86_64/libkworkspace/kdisplaymanager.cpp:337
#7  0x00007f327400cbe9 in SessionRunner::SessionRunner(QObject*, QList<QVariant> const&) (args=..., parent=<optimized out>, this=0x558bfd5f91f0) at /usr/include/qt5/QtCore/qarraydata.h:257
#8  KPluginFactory::createInstance<SessionRunner, QObject>(QWidget*, QObject*, QList<QVariant> const&) (parentWidget=<optimized out>, parent=<optimized out>, args=...) at /usr/include/KF5/KCoreAddons/kpluginfactory.h:520
#9  0x00007f32c21fbe42 in KPluginFactory::create(char const*, QWidget*, QObject*, QList<QVariant> const&, QString const&) () at /lib64/libKF5CoreAddons.so.5
#10 0x00007f329843efb2 in Plasma::RunnerManagerPrivate::loadInstalledRunner(KPluginMetaData const&) () at /lib64/libKF5Runner.so.5
#11 0x00007f329843ffac in Plasma::RunnerManagerPrivate::loadRunners() () at /lib64/libKF5Runner.so.5
#12 0x00007f3298442518 in Plasma::RunnerManager::launchQuery(QString const&, QString const&) () at /lib64/libKF5Runner.so.5
#13 0x00007f3298442729 in Plasma::RunnerManager::launchQuery(QString const&) () at /lib64/libKF5Runner.so.5
#14 0x00007f32c126b266 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffda7d658b0, r=0x558bfd4f4530, this=0x558bfcea3c30) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#15 doActivate<false>(QObject*, int, void**) (sender=0x558bfd4f4570, signal_index=3, argv=0x7ffda7d658b0) at kernel/qobject.cpp:3886
#16 0x00007f32c126ee9a in QTimer::timeout(QTimer::QPrivateSignal) (this=<optimized out>, _t1=...) at .moc/moc_qtimer.cpp:205
#17 0x00007f32c1263d8f in QObject::event(QEvent*) (this=0x558bfd4f4570, e=0x7ffda7d65a00) at kernel/qobject.cpp:1291
#18 0x00007f32c1c8a15f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#19 0x00007f32c123cbf8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x558bfd4f4570, event=0x7ffda7d65a00) at ../../include/QtCore/5.15.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#20 0x00007f32c1286dd3 in QTimerInfoList::activateTimers() (this=0x558bf9139c50) at kernel/qtimerinfo_unix.cpp:643
#21 0x00007f32c128768c in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:183
#22 idleTimerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:230
#23 0x00007f32bf7d6fd7 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#24 0x00007f32bf827d88 in g_main_context_iterate.constprop () at /lib64/libglib-2.0.so.0
#25 0x00007f32bf7d441f in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#26 0x00007f32c1287a2f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x558bf9139a80, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#27 0x00007f32c123b65b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffda7d65c40, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#28 0x00007f32c1243020 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#29 0x0000558bf8a52195 in main(int, char**) (argc=<optimized out>, argv=0x7ffda7d65e50) at /usr/src/debug/plasma-workspace-5.19.5-3.fc33.x86_64/shell/main.cpp:224
[Inferior 1 (process 3861) detached]

The reporter indicates this bug may be a duplicate of or related to bug 428415, bug 405751.

Possible duplicates by query: bug 428415, bug 421196, bug 405751, bug 391358, bug 389806.


STEPS TO REPRODUCE
1. click on the start menu
2. start to type a word

OBSERVED RESULT
The Plasmashell crash

EXPECTED RESULT
it will filter the app list using the typed word