SUMMARY
KWin suddenly crashed when trying to open a window.  Couldn't reproduce for the second time.


STEPS TO REPRODUCE
1. Click Discover icon in the system tray
2. 
3. 

OBSERVED RESULT
Crash

EXPECTED RESULT
No crash

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.26.80
KDE Frameworks Version: 5.102
Qt Version: 5.15.7

ADDITIONAL INFORMATION
(gdb) bt
#0  __GI___pthread_sigmask (how=1, newmask=<optimized out>, oldmask=0x0) at pthread_sigmask.c:43
#1  0x00007f10ec95eafd in __GI___sigprocmask (how=<optimized out>, set=<optimized out>, oset=<optimized out>) at ../sysdeps/unix/sysv/linux/sigprocmask.c:25
#2  0x00007f10efb3888b in KCrash::setCrashHandler(void (*)(int)) (handler=handler@entry=0x0) at /usr/src/debug/kcrash-5.101.0git.20221203T094416~fbbdfff/src/kcrash.cpp:415
#3  0x00007f10efb3ada6 in KCrash::defaultCrashHandler(int) (sig=11) at /usr/src/debug/kcrash-5.101.0git.20221203T094416~fbbdfff/src/kcrash.cpp:632
#4  0x00007f10ec95e8e0 in <signal handler called> () at /lib64/libc.so.6
#5  0x0000000000000050 in  ()
#6  0x00007f10edce4c79 in QMetaObject::cast(QObject const*) const (this=0x7f10ef99ce00 <KWin::X11Window::staticMetaObject>, obj=obj@entry=0x55b04ba197d0) at kernel/qmetaobject.cpp:389
#7  0x00007f10ef644a38 in qobject_cast<KWin::X11Window const*>(QObject const*) (object=0x55b04ba197d0) at /usr/include/qt5/QtCore/qobject.h:528
#8  KWin::computeLayer (window=0x55b04ba197d0) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:507
#9  KWin::Workspace::constrainedStackingOrder() (this=this@entry=0x55b048a5cb80) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:523
#10 0x00007f10ef644fb8 in KWin::Workspace::updateStackingOrder(bool) (propagate_new_windows=true, this=0x55b048a5cb80) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:104
#11 KWin::Workspace::updateStackingOrder(bool) (this=0x55b048a5cb80, propagate_new_windows=<optimized out>) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:96
#12 0x00007f10ef6453d0 in KWin::Workspace::blockStackingUpdates(bool) (block=<optimized out>, this=<optimized out>) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:581
#13 KWin::Workspace::blockStackingUpdates(bool) (this=<optimized out>, block=<optimized out>) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/layers.cpp:572
#14 0x00007f10ef61853b in KWin::X11Window::windowEvent(xcb_generic_event_t*) (this=0x55b04ba197d0, e=e@entry=0x55b049220fb0) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/events.cpp:387
#15 0x00007f10ef61aaca in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) (this=0x55b048a5cb80, e=0x55b049220fb0) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/events.cpp:156
#16 0x00007f10edcd969f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=message@entry=0x55b049220fb0, result=result@entry=0x7ffdd3e30ff8) at kernel/qabstracteventdispatcher.cpp:495
#17 0x00007f10e86f2daf in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=this@entry=0x55b048686a30, event=event@entry=0x55b049220fb0) at qxcbconnection.cpp:579
#18 0x00007f10e86f4466 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55b048686a30, flags=...) at qxcbconnection.cpp:1065
#19 0x00007f10e871a0f3 in QXcbUnixEventDispatcher::~QXcbUnixEventDispatcher() (this=0x55b04ba197d0, __in_chrg=<optimized out>) at qxcbeventdispatcher.cpp:56
#20 QXcbUnixEventDispatcher::~QXcbUnixEventDispatcher() (this=0x55b04ba197d0, __in_chrg=<optimized out>) at qxcbeventdispatcher.cpp:56
#21 0x00007f10eb86aa90 in g_main_dispatch (context=0x7f10e0005010) at ../glib/gmain.c:3444
#22 g_main_context_dispatch (context=context@entry=0x7f10e0005010) at ../glib/gmain.c:4162
#23 0x00007f10eb86ae48 in g_main_context_iterate (context=context@entry=0x7f10e0005010, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4238
#24 0x00007f10eb86aedc in g_main_context_iteration (context=0x7f10e0005010, may_block=1) at ../glib/gmain.c:4303
#25 0x00007f10edd33b56 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55b048751430, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#26 0x00007f10edcdab9b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffdd3e31280, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#27 0x00007f10edce2d06 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#28 0x000055b046ad44d0 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin-5.26.80git.20221211T150128~ffad2dd7/src/main_x11.cpp:447