Bug 460446

SUMMARY

kwin_x11 5.26.0 crashes with an xcb application. It seems the issue is recent.
It happens around when the window is exposed. As long as that window exist, kwin_x11 keeps crashing in a loop.
The window is created by a test program of mine.

There are two stacktraces.  One for the initial crash, one for every following crash until I kill the "bad" window.
Here is that one's backtrace:

(gdb) bt full
#0  KWin::Output::uuid() const (this=0x0) at /usr/src/debug/kwin/kwin-5.26.0/src/core/output.cpp:93
#1  0x00007f0e9a0458b3 in KWin::PlacementTracker::saveGeometry(KWin::Window*) (this=<optimized out>, window=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/placementtracker.cpp:145

                  data = @0x560a241bfae8: {outputUuid = {data1 = 3846842269, data2 = 2183, data3 = 21810, data4 = "\254\020\346_\354+x\210"}, geometry = {xp = 448, yp = 183, w = 1024, h = -4294966499}, maximize = KWin::MaximizeRestore, quickTile = {i = 0}, geometryRestore = {xp = 448, yp = 183, w = 1024, h = 797}, fullscreen = false, fullscreenGeometryRestore = {xp = 0, yp = 0, w = 0, h = 0}, interactiveMoveResizeCount = 0}
#2  0x00007f0e986bdf21 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffc31754cf0, r=<optimized out>, this=0x560a2418d4c0, this=<optimized out>, r=<optimized out>, a=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
        receiver = <optimized out>
        td = <optimized out>
        receiverInSameThread = <optimized out>
        senderData = {previous = 0x0, receiver = 0x7f0e8c011f60, sender = 0x560a2411a130, signal = 22}
        c = 0x560a2418d4f0
        connections = {d = 0x560a23fe3720}
        list = <optimized out>
        inSenderThread = true
        highestConnectionId = 50
        signalVector = 0x560a241e7700
        currentThreadId = 0x7f0e93404a80
        sp = <optimized out>
        signal_spy_set = 0x0
        empty_argv = {0x0}
        senderDeleted = false
#3  doActivate<false>(QObject*, int, void**) (sender=0x560a2411a130, signal_index=22, argv=0x7ffc31754cf0) at kernel/qobject.cpp:3919
        receiver = <optimized out>
        td = <optimized out>
        receiverInSameThread = <optimized out>
        senderData = {previous = 0x0, receiver = 0x7f0e8c011f60, sender = 0x560a2411a130, signal = 22}
        c = 0x560a2418d4f0
        connections = {d = 0x560a23fe3720}
        list = <optimized out>
        inSenderThread = true
        highestConnectionId = 50
        signalVector = 0x560a241e7700
        currentThreadId = 0x7f0e93404a80
        sp = <optimized out>
        signal_spy_set = 0x0
        empty_argv = {0x0}
        senderDeleted = false
#4  0x00007f0e9a0cdd5c in KWin::Window::frameGeometryChanged(KWin::Window*, QRectF const&) (this=<optimized out>, _t1=<optimized out>, _t2=<optimized out>) at /usr/src/debug/kwin/build/src/kwin_autogen/include/moc_window.cpp:1671
        _a = {0x0, 0x7ffc31754ce8, 0x7ffc31754d70}
#5  0x00007f0e9a10b557 in KWin::X11Window::moveResizeInternal(QRectF const&, KWin::Window::MoveResizeMode) (this=0x560a2411a130, rect=<optimized out>, mode=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:4213
        frameGeometry = {xp = 448, yp = 183, w = 1024, h = -4294966499}
        oldBufferGeometry = {xp = 448, yp = 183, w = 1024, h = 797}
        oldFrameGeometry = {xp = 448, yp = 183, w = 1024, h = 797}
        oldClientGeometry = {xp = 448, yp = 212, w = 1024, h = 768}
        oldOutput = 0x560a23d08b10
#6  0x00007f0e9a10a5dc in KWin::X11Window::getWmNormalHints() (this=0x560a2411a130) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:3705
        origClientGeometry = {xp = 448, yp = 212, w = 1024, h = 768}
        new_size = {wd = 1024, ht = -4294966499}
        hadFixedAspect = <optimized out>
#7  0x00007f0e99fffe38 in KWin::X11Window::windowEvent(xcb_generic_event_t*) (this=0x560a2411a130, e=e@entry=0x7f0e8400f5c0) at /usr/src/debug/kwin/kwin-5.26.0/src/events.cpp:415
        eventType = <optimized out>
#8  0x00007f0e9a00242a in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) (this=0x560a24087040, e=0x7f0e8400f5c0) at /usr/src/debug/kwin/kwin-5.26.0/src/events.cpp:159
        window = <optimized out>
        eventType = 28 '\034'
        eventWindow = 75497472
#9  0x00007f0e9868403f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=message@entry=0x7f0e8400f5c0, result=result@entry=0x7ffc317550c0)
    at kernel/qabstracteventdispatcher.cpp:495
        filter = <optimized out>
        i = 2
        scopeLevelCounter = {threadData = 0x560a23d0bd70}
        d = 0x560a23d34ec0
#10 0x00007f0e92707030 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=0x560a23d3bf70, event=0x7f0e8400f5c0) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:579
        dispatcher = <optimized out>
        result = 0
        response_type = <optimized out>
        handled = <optimized out>
#11 0x00007f0e9270b3a0 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x560a23d3bf70, flags=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1065
        event = 0x7f0e8400f5c0
        eventGuard = {d = 0x7f0e8400f5c0}
        connection_error = <optimized out>
#12 0x00007f0e9272f6f2 in QXcbUnixEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x560a23e5abd0, flags=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:61
        didSendEvents = true
#13 0x00007f0e98685edc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffc317552a0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
        d = 0x7f0e8c002b00
        threadData = <optimized out>
        locker = {val = 94601550545720}
        app = <optimized out>
#14 0x00007f0e986909f9 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
        threadData = 0x560a23d0bd70

                      eventLoop = {<QObject> = {_vptr.QObject = 0x7f0e98911750 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f0e98774920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7f0e98774800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7f0e986be350 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f0e8c002b00}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f0e9879b4a0 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7f0e98798620 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e9890a580 <QObject::staticMetaObject>}, stringdata = 0x7f0e987702e0 <_ZL29qt_meta_stringdata_QEventLoop.lto_priv.0>, data = 0x7f0e98770280 <_ZL23qt_meta_data_QEventLoop.lto_priv.0>, static_metacall = 0x7f0e98684720 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
#15 0x00007f0e98b3a0e2 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1870
#16 0x00007f0e97d76f2a in QApplication::exec() () at kernel/qapplication.cpp:2829
#17 0x0000560a237eee4d in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/main_x11.cpp:409
        format = {d = 0x560a23d30f80}

                  a = {<KWin::Application> = {<QApplication> = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x560a238cd3d8 <vtable for KWin::ApplicationX11+16>, static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f0e98774920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7f0e98774800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7f0e986be350 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x560a23d30fd0}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f0e9879b4a0 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7f0e98798620 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e9890a580 <QObject::staticMetaObject>}, stringdata = 0x7f0e98770060 <_ZL35qt_meta_stringdata_QCoreApplication.lto_priv.0>, data = 0x7f0e9876ff40 <_ZL29qt_meta_data_QCoreApplication.lto_priv.0>, static_metacall = 0x7f0e98690000 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7ffc317553b0}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e9890f3a0 <QCoreApplication::staticMetaObject>}, stringdata = 0x7f0e98f5a720 <_ZL34qt_meta_stringdata_QGuiApplication.lto_priv.0>, data = 0x7f0e98f5a4a0 <_ZL28qt_meta_data_QGuiApplication.lto_priv.0>, static_metacall = 0x7f0e98b4b780 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e99046e80 <QGuiApplication::staticMetaObject>}, stringdata = 0x7f0e981468e0 <_ZL31qt_meta_stringdata_QApplication.lto_priv.0>, data = 0x7f0e98146760 <_ZL25qt_meta_data_QApplication.lto_priv.0>, static_metacall = 0x7f0e97d7a3f0 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e982835e0 <QApplication::staticMetaObject>}, stringdata = 0x7f0e9a2637a0 <_ZL36qt_meta_stringdata_KWin__Application.lto_priv.0>, data = 0x7f0e9a25df60 <_ZL30qt_meta_data_KWin__Application.lto_priv.0>, static_metacall = 0x7f0e99f71c00 <KWin::Application::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, m_eventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic<int> = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x560a24146100}, d = 0x560a24146100}}, m_genericEventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic<int> = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x560a24198eb0}, d = 0x560a24198eb0}}, m_eventFilter = std::unique_ptr<KWin::XcbEventFilter> = {get() = 0x560a23fe6d10}, m_configLock = false, m_config = {d = 0x560a23f3dee0}, m_kxkbConfig = {d = 0x7f0e84004dc0}, m_operationMode = KWin::Application::OperationModeX11, m_x11Time = 7021374, m_rootWindow = 476, m_connection = 0x560a23d3d780, m_useKActivities = true, m_session = std::unique_ptr<KWin::Session> = {get() = 0x560a23fdf8d0}, m_platform = std::unique_ptr<KWin::Platform> = {get() = 0x560a23fbda20}, m_terminating = false, m_xwaylandScale = 1, m_processEnvironment = {d = {d = 0x0}}, m_pluginManager = std::unique_ptr<KWin::PluginManager> = {get() = 0x560a241df110}, m_inputMethod = std::unique_ptr<KWin::InputMethod> = {get() = 0x0}, m_colorManager = std::unique_ptr<KWin::ColorManager> = {get() = 0x560a24146510}, m_tabletModeManager = std::unique_ptr<KWin::TabletModeManager> = {get() = 0x7f0e84004ac0}, m_screenLockerWatcher = std::unique_ptr<KWin::ScreenLockerWatcher> = {get() = 0x560a23fec5e0}}, static staticMetaObject = {d = {superdata = {direct = 0x7f0e9a382780 <KWin::Application::staticMetaObject>}, stringdata = 0x560a23891800 <qt_meta_stringdata_KWin__ApplicationX11>, data = 0x560a23890d00 <qt_meta_data_KWin__ApplicationX11>, static_metacall = 0x560a237f0e80 <KWin::ApplicationX11::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, owner = std::unique_ptr<KWin::KWinSelectionOwner> = {get() = 0x7f0e840040a0}, m_replace = true}
        replaceOption = {d = {d = 0x560a23d30b60}}
        parser = {d = 0x560a23fc2dc0}
        noActivitiesOption = {d = {d = 0x560a23fe82a0}}


Dump of assembler code for function _ZNK4KWin6Output4uuidEv:
   0x00007f0e99faa2f0 <+0>:     endbr64
=> 0x00007f0e99faa2f4 <+4>:     mov    0xa8(%rdi),%rax
   0x00007f0e99faa2fb <+11>:    mov    0xb0(%rdi),%rdx
   0x00007f0e99faa302 <+18>:    ret

(gdb) print $rdi
$1 = 0

An obvious NULL reference.

Here is the sequence of events that seem to trigger the issue. The value 75497472 is the xcb_window_t id value.

XcbWindowManager::eventLoop() begin
XCB_REPARENT_NOTIFY: 75497472
XCB_MAP_NOTIFY: 75497472
XCB_EXPOSE:1x1 0,0 sequence: 9 window: 75497472
XCB_EXPOSE: show: 0000555555761E20 1 x 1 window: 75497472 exposed(): 1
XCB_FOCUS_IN: 75497472
XCB_EXPOSE:1x1 0,0 sequence: 9 window: 75497472
XCB_EXPOSE: show: 0000555555761E20 1 x 1 window: 75497472 exposed(): 1
XCB_CONFIGURE_NOTIFY: 75497472
XCB_RESIZE_REQUEST: 0000555555761E20 1024 x 768
XCB_EXPOSE:1024x768 0,0 sequence: 9 window: 75497472
XCB_EXPOSE: show: 0000555555761E20 1024 x 768 window: 75497472 exposed(): 1
XCB_FOCUS_OUT: 75497472
XCB_CONFIGURE_NOTIFY: 75497472
XCB_RESIZE_REQUEST: 0000555555761E20 1024 x 768

STEPS TO REPRODUCE
Hard to say, beside this serie of events. But I've pasted the code that seems to be the cause below.

OBSERVED RESULT
Crash loop.  Rarely : no crash until a second or two has elapsed (and during that time the program is drawn as intended)

EXPECTED RESULT
Not crashing.

SOFTWARE/OS VERSIONS
I'm on Artix, update of today. (I've not touchrf the code crashing kwin_x11 for a while though so the issue may have appeared during these last two weeks.)
Possibly relevant packages:

linux 6.0.1.artix1-1 (from today)
kdeplasma-addons 5.26.0-1.2
plasma-browser-integration 5.26.0-1.3
plasma-desktop 5.26.0-1
plasma-disks 5.26.0-1
plasma-firewall 5.26.0-1
plasma-framework 5.99.0-1
plasma-integration 5.26.0-1
plasma-meta 5.25-1
plasma-nm 5.26.0-1
plasma-pa 5.26.0-1
plasma-systemmonitor 5.26.0-1
plasma-thunderbolt 5.26.0-1
plasma-vault 5.26.0-1
plasma-workspace 5.26.0-1.2
plasma-workspace-wallpapers 5.26.0-1
qt5-base 5.15.6+kde+r180-1
qt5-declarative 5.15.6+kde+r20-1
qt5-graphicaleffects 5.15.6+kde+r0-1
qt5-location 5.15.6+kde+r3-1
qt5-multimedia 5.15.6+kde+r1-1
qt5-networkauth 5.15.6+kde+r0-1
qt5-quickcontrols 5.15.6+kde+r0-1
qt5-quickcontrols2 5.15.6+kde+r5-1
qt5-sensors 5.15.6+kde+r0-1
qt5-speech 5.15.6+kde+r1-1
qt5-svg 5.15.6+kde+r9-1
qt5-tools 5.15.6+kde+r1-1
qt5-translations 5.15.6+kde+r2-1
qt5-wayland 5.15.6+kde+r50-1
qt5-webchannel 5.15.6+kde+r3-1
qt5-webview 5.15.6+kde+r0-1
qt5-x11extras 5.15.6+kde+r0-1
qt5-xmlpatterns 5.15.6+kde+r0-1
xdg-desktop-portal-kde 5.26.0-1

ADDITIONAL INFORMATION

The program that crashes kwin_x11 opens an xcb window in order to do some Vulkan rendering (the Vulkan library isn't even loaded at the time of the crash though)
The thread creating and setting-up the window is separate from the one handling the event loop.

As long as the window of the program exists (paused in its debugger) kwin_x11 will crash in a loop. I presume something in its setup/state is the cause. After the first crash, the stacktrace becomes:

#0  0x00007fb6aab140bf in __GI___poll (fds=fds@entry=0x7ffc7bf5c710, nfds=nfds@entry=1, timeout=timeout@entry=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
        sc_ret = -516
        sc_cancel_oldtype = 0
#1  0x00007fb6ada66afa in poll (__timeout=1000, __nfds=1, __fds=0x7ffc7bf5c710) at /usr/include/bits/poll2.h:39
        fd = {fd = 3, events = 1, revents = 0}
        r = <optimized out>
        clsockfd = <optimized out>
        msg = "\001\000/run/user/1000/kcra"
        running = <optimized out>
        sockfd = 3
        pid = 10695
#2  pollDrKonqiSocket (sockfd=3, pid=10695) at /usr/src/debug/kcrash/kcrash-5.99.0/src/kcrash.cpp:865
        fd = {fd = 3, events = 1, revents = 0}
        r = <optimized out>
        clsockfd = <optimized out>
        msg = "\001\000/run/user/1000/kcra"
        running = <optimized out>
        sockfd = 3
        pid = 10695
#3  KCrash::startProcess(int, char const**, bool) (argv=argv@entry=0x7ffc7bf5c858, waitAndExit=waitAndExit@entry=true, argc=<optimized out>) at /usr/src/debug/kcrash/kcrash-5.99.0/src/kcrash.cpp:727
        running = <optimized out>
        sockfd = 3
        pid = 10695
#4  0x00007fb6ada677fc in KCrash::defaultCrashHandler(int) (sig=11) at /usr/src/debug/kcrash/kcrash-5.99.0/src/kcrash.cpp:623

                  data = {<KCrash::MetadataWriter> = {_vptr.MetadataWriter = 0x7fb6ada6a8b8 <vtable for KCrash::Metadata+16>}, argv = {_M_elems = {0x55fedecd63b0 "/usr/lib/drkonqi", 0x7fb6ada680c1 "--platform", 0x55fedeea40b8 "xcb", 0x7fb6ada680d4 "--display", 0x55fedea00e80 ":0", 0x7fb6ada680de "--appname", 0x55fedecbc710 "kwin_x11", 0x7fb6ada680f7 "--apppath", 0x55fedea12c00 "/usr/bin", 0x7fb6ada68104 "--signal", 0x7ffc7bf5c826 "11", 0x7fb6ada68112 "--pid", 0x7ffc7bf5c830 "10684", 0x7fb6ada68118 "--appversion", 0x55fedece7578 "5.26.0", 0x7fb6ada68125 "--programname", 0x55fedece2b78 "KWin", 0x7fb6ada68133 "--bugaddress", 0x55fedecee068 "submit@bugs.kde.org", 0x7fb6ada6814e "--startupid", 0x55fedeea40e8 "0", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}, argc = 21, m_writer = 0x0}
        platformName = {d = 0x55fedeea40a0}
        about = <optimized out>
        argv = 0x7ffc7bf5c858
        ini = {<KCrash::MetadataWriter> = {_vptr.MetadataWriter = 0x7fb6ada6a8e8 <vtable for KCrash::MetadataINIWriter+16>}, writable = false, fd = -1, iniLine = {_M_elems = '\000' <repeats 1023 times>}}
        sigtxt = "11\000sg\251\266\177\000"
        pidtxt = "10684\000\000\000\262Ri\251\266\177\000\000\000\000\000"
        startupId = {d = 0x55fedeea40d0}
        argc = <optimized out>
        crashRecursionCounter = 2
#5  0x00007fb6aaa51a00 in <signal handler called> () at /usr/lib/libc.so.6
#6  KWin::Output::scale() const (this=this@entry=0x0) at /usr/src/debug/kwin/kwin-5.26.0/src/core/output.cpp:164
#7  0x00007fb6ad3ad132 in KWin::Output::geometry() const (this=0x0) at /usr/src/debug/kwin/kwin-5.26.0/src/core/output.cpp:169
#8  0x00007fb6ad4ecee3 in KWin::Workspace::clientArea(KWin::clientAreaOption, KWin::Output const*, KWin::VirtualDesktop const*) const (this=this@entry=0x55feded8d290, opt=opt@entry=KWin::FullScreenArea, output=<optimized out>,
    output@entry=0x0, desktop=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:2499
#9  0x00007fb6ad4ed29e in KWin::Workspace::clientArea(KWin::clientAreaOption, KWin::Window const*, KWin::Output const*) const
    (this=this@entry=0x55feded8d290, opt=opt@entry=KWin::FullScreenArea, window=window@entry=0x55fedee1f830, output=0x0) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:2523
        desktop = <optimized out>
#10 0x00007fb6ad4ed348 in KWin::Workspace::clientArea(KWin::clientAreaOption, KWin::Window const*) const (this=0x55feded8d290, opt=KWin::FullScreenArea, window=0x55fedee1f830) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:2511
#11 0x00007fb6ad4f6182 in KWin::X11Window::isFullScreenable() const (this=0x55fedee1f830) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:1295
        fullScreenArea = {xp = 0, yp = 6.9377790352289549e-310, w = 2.3117479788605678e-318, h = 6.9377959010542321e-310}
#12 0x00007fb6ad507a46 in KWin::X11Window::userCanSetFullScreen() const (this=0x55fedee1f830) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:4547
#13 0x00007fb6ad4ff62e in KWin::X11Window::updateAllowedActions(bool) (this=0x55fedee1f830, force=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:2434
        old_allowed_actions = {i = 0}
        relevant = {i = <optimized out>}
#14 0x00007fb6ad4fbfce in KWin::X11Window::manage(unsigned int, bool) (this=0x55fedee1f830, w=<optimized out>, isMapped=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/x11window.cpp:872
        stacking_blocker = {ws = 0x55feded8d290}

                    attr = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::WindowAttributesData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c6f8 <vtable for KWin::Xcb::Wrapper<KWin::Xcb::WindowAttributesData, unsigned int>+16>, m_retrieved = true, m_cookie = {sequence = 1632}, m_window = 75497472, m_reply = 0x7fb698007880}, <No data fields>}

                      windowGeometry = {<KWin::Xcb::Wrapper<KWin::Xcb::GeometryData, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::GeometryData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c648 <vtable for KWin::Xcb::WindowGeometry+16>, m_retrieved = true, m_cookie = {sequence = 1633}, m_window = 75497472, m_reply = 0x55fedeefe290}, <No data fields>}, <No data fields>}
        properties = {i = 553549824}
        properties2 = {i = 1340679819}

                  wmClientLeaderCookie = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c078 <vtable for KWin::Xcb::Property+16>, m_retrieved = true, m_cookie = {sequence = 1696}, m_window = 75497472, m_reply = 0x7fb69800d9f0}, <No data fields>}, m_type = 33}

                  skipCloseAnimationCookie = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c078 <vtable for KWin::Xcb::Property+16>, m_retrieved = true, m_cookie = {sequence = 1697}, m_window = 75497472, m_reply = 0x7fb69800da60}, <No data fields>}, m_type = 6}

                  showOnScreenEdgeCookie = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c078 <vtable for KWin::Xcb::Property+16>, m_retrieved = false, m_cookie = {sequence = 1698}, m_window = 75497472, m_reply = 0x0}, <No data fields>}, m_type = 6}

                    colorSchemeCookie = {<KWin::Xcb::Property> = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c938 <vtable for KWin::Xcb::StringProperty+16>, m_retrieved = true, m_cookie = {sequence = 1699}, m_window = 75497472, m_reply = 0x7fb69800db40}, <No data fields>}, m_type = 31}, <No data fields>}

                  firstInTabBoxCookie = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c078 <vtable for KWin::Xcb::Property+16>, m_retrieved = true, m_cookie = {sequence = 1700}, m_window = 75497472, m_reply = 0x7fb69800dbb0}, <No data fields>}, m_type = 469}

                    transientCookie = {<KWin::Xcb::Property> = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76ca80 <vtable for KWin::Xcb::TransientFor+16>, m_retrieved = true, m_cookie = {sequence = 1701}, m_window = 75497472, m_reply = 0x7fb69800dc20}, <No data fields>}, m_type = 33}, <No data fields>}

                    activitiesCookie = {<KWin::Xcb::Property> = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c938 <vtable for KWin::Xcb::StringProperty+16>, m_retrieved = true, m_cookie = {sequence = 1702}, m_window = 75497472, m_reply = 0x7fb69800dc90}, <No data fields>}, m_type = 31}, <No data fields>}

                    applicationMenuServiceNameCookie = {<KWin::Xcb::Property> = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c938 <vtable for KWin::Xcb::StringProperty+16>, m_retrieved = true, m_cookie = {sequence = 1703}, m_window = 75497472, m_reply = 0x7fb69800dd20}, <No data fields>}, m_type = 31}, <No data fields>}

                    applicationMenuObjectPathCookie = {<KWin::Xcb::Property> = {<KWin::Xcb::Wrapper<KWin::Xcb::PropertyData, unsigned char, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::PropertyData>> = {_vptr.AbstractWrapper = 0x7fb6ad76c938 <vtable for KWin::Xcb::StringProperty+16>, m_retrieved = true, m_cookie = {sequence = 1704}, m_window = 75497472, m_reply = 0x7fb69800dd90}, <No data fields>}, m_type = 31}, <No data fields>}
        init_minimize = <optimized out>
        desktopFileName = {d = 0x7fb6abb75ec0 <QArrayData::shared_null>}
        asn_id = {d = 0x7fb69800de70}
        asn_data = {d = 0x55fedeed3010}
        asn_valid = false
        session = <optimized out>
        initialDesktops = std::optional<QVector<KWin::VirtualDesktop*>> = {[contained value] = {d = 0x55fedee204b0}}

                      activitiesList = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic<int> = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x7fb6abb75e90 <QListData::shared_null>}, d = 0x7fb6abb75e90 <QListData::shared_null>}}, <No data fields>}
        geom = {xp = 0, yp = -29, w = 1024, h = 768}
        placementDone = <optimized out>
        area = {xp = 0, yp = 0, w = 3840, h = 1200}
        partial_keep_in_area = <optimized out>
        usePosition = <optimized out>
        dontKeepInArea = <optimized out>
        constrainedClientSize = {wd = 1024, ht = -4294966528}
        forced_pos = {xp = -2147483648, yp = -2147483648}
#15 0x00007fb6ad4de4a7 in KWin::Workspace::createX11Window(unsigned int, bool) (this=0x55feded8d290, windowId=75497472, is_mapped=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:853
        blocker = {ws = 0x55feded8d290}
        window = 0x55fedee1f830
#16 0x00007fb6ad4f39ad in KWin::Workspace::initializeX11() (this=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:394

                    attr = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::WindowAttributesData>> = {_vptr.AbstractWrapper = <optimized out>, m_retrieved = true, m_cookie = {sequence = <optimized out>}, m_window = <optimized out>, m_reply = 0x7fb69800bb40}, <No data fields>}
        i = 74

                      tree = {<KWin::Xcb::Wrapper<KWin::Xcb::TreeData, unsigned int>> = {<KWin::Xcb::AbstractWrapper<KWin::Xcb::TreeData>> = {_vptr.AbstractWrapper = <optimized out>, m_retrieved = true, m_cookie = {sequence = <optimized out>}, m_window = <optimized out>, m_reply = 0x7fb698006f90}, <No data fields>}, <No data fields>}
        windowGeometries = {d = 0x55fedee283c0}
        viewports = <optimized out>
        blocker = {ws = <optimized out>}
        wins = <optimized out>
        windowAttributes = {d = 0x55fedef373a0}
        desktop_geometry = {width = -559647280, height = 22014}
        nullFocusValues = {1}
        vds = <optimized out>
        client_info = {<NET> = {<No data fields>}, _vptr.NETRootInfo = 0x7fb6ac5af7b8 <vtable for NETRootInfo+16>, p = 0x55fedee828b0}
        sessionRestored = <optimized out>
        newActiveWindow = <optimized out>
#17 0x00007fb6ad4db9f7 in KWin::Workspace::init() (this=0x55feded8d290) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:263
        vds = <optimized out>
#18 0x00007fb6ad4dd4e4 in KWin::Workspace::Workspace() (this=<optimized out>, this=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/workspace.cpp:193
        reparseConfigFuture = {d = {_vptr.QFutureInterfaceBase = 0x7fb6abd13528 <vtable for QFutureInterfaceBase+16>, d = 0x55feded8f3a0}}
#19 0x00007fb6ad437cf7 in KWin::Application::createWorkspace() (this=0x7ffc7bf5e210) at /usr/src/debug/kwin/kwin-5.26.0/src/main.cpp:242
#20 0x000055feddf9ca60 in operator() (__closure=0x55fedecf05e0) at /usr/src/debug/kwin/kwin-5.26.0/src/main_x11.cpp:244
        maskValues = {1048576}
        this = 0x7ffc7bf5e210
#21 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KWin::ApplicationX11::performStartup()::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/qt/QtCore/qobjectdefs_impl.h:146
#22 QtPrivate::Functor<KWin::ApplicationX11::performStartup()::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/qt/QtCore/qobjectdefs_impl.h:256
#23 QtPrivate::QFunctorSlotObject<KWin::ApplicationX11::performStartup()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *)
    (which=<optimized out>, this_=0x55fedecf05d0, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/qt/QtCore/qobjectdefs_impl.h:443
#24 0x00007fb6ababdf21 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffc7bf5dd80, r=<optimized out>, this=0x55fedecf05d0, this=<optimized out>, r=<optimized out>, a=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
        receiver = <optimized out>
        td = <optimized out>
        receiverInSameThread = <optimized out>
        senderData = {previous = 0x0, receiver = 0x7ffc7bf5e210, sender = 0x7fb698002af0, signal = 4}
        c = 0x55fedeceed50
        connections = {d = 0x55fedeceec60}
        list = <optimized out>
        inSenderThread = true
        highestConnectionId = 3
        signalVector = 0x55fedecea690
        currentThreadId = 0x7fb6a6107a80
        sp = <optimized out>
        signal_spy_set = 0x0
        empty_argv = {0x0}
        senderDeleted = false
#25 doActivate<false>(QObject*, int, void**) (sender=0x7fb698002af0, signal_index=4, argv=0x7ffc7bf5dd80) at kernel/qobject.cpp:3919
        receiver = <optimized out>
        td = <optimized out>
        receiverInSameThread = <optimized out>
        senderData = {previous = 0x0, receiver = 0x7ffc7bf5e210, sender = 0x7fb698002af0, signal = 4}
        c = 0x55fedeceed50
        connections = {d = 0x55fedeceec60}
        list = <optimized out>
        inSenderThread = true
        highestConnectionId = 3
        signalVector = 0x55fedecea690
        currentThreadId = 0x7fb6a6107a80
        sp = <optimized out>
        signal_spy_set = 0x0
        empty_argv = {0x0}
        senderDeleted = false
#26 0x00007fb6ac58634d in KSelectionOwner::Private::claimSucceeded() (this=this@entry=0x55fedece1690) at /usr/src/debug/kwindowsystem/kwindowsystem-5.99.0/src/platforms/xcb/kselectionowner.cpp:194

                      ev = {response_type = 33 '!', format = 32 ' ', sequence = 56993, window = 476, type = 282, data = {data8 = "G\302\177\000\321\001\000\000\v\000\340\004\000\000\000\000\000\000\000", data16 = {49735, 127, 465, 0, 11, 1248, 0, 0, 0, 0}, data32 = {8372807, 465, 81788939, 0, 0}}}
#27 0x00007fb6ac58c144 in KSelectionOwner::Private::gotTimestamp() (this=0x55fedece1690) at /usr/src/debug/kwindowsystem/kwindowsystem-5.99.0/src/platforms/xcb/kselectionowner.cpp:228
        c = 0x55fedea475d0
        new_owner = 81788939
        ev = <optimized out>
        event = <optimized out>
        response_type = <optimized out>
#28 KSelectionOwner::filterEvent(void*) (this=<optimized out>, ev_P=<optimized out>) at /usr/src/debug/kwindowsystem/kwindowsystem-5.99.0/src/platforms/xcb/kselectionowner.cpp:422
        ev = <optimized out>
        event = <optimized out>
        response_type = <optimized out>
#29 0x00007fb6aba8403f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=message@entry=0x55fedecec830, result=result@entry=0x7ffc7bf5df20)
    at kernel/qabstracteventdispatcher.cpp:495
        filter = <optimized out>
        i = 0
        scopeLevelCounter = {threadData = 0x55fedea15d70}
        d = 0x55fedea3ed10
#30 0x00007fb6a5b07030 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=0x55fedea45dc0, event=0x55fedecec830) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:579
        dispatcher = <optimized out>
        result = 0
        response_type = <optimized out>
        handled = <optimized out>
#31 0x00007fb6a5b0b3a0 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55fedea45dc0, flags=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1065
        event = 0x55fedecec830
        eventGuard = {d = 0x55fedecec830}
        connection_error = <optimized out>
#32 0x00007fb6a5b2f6f2 in QXcbUnixEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55fedeb63d20, flags=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:61
        didSendEvents = true
#33 0x00007fb6aba85edc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffc7bf5e100, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
        d = 0x7fb6a0002aa0
        threadData = <optimized out>
        locker = {val = 94553145172792}
        app = <optimized out>
#34 0x00007fb6aba909f9 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
        threadData = 0x55fedea15d70

                      eventLoop = {<QObject> = {_vptr.QObject = 0x7fb6abd11750 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7fb6abb74920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7fb6abb74800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7fb6ababe350 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7fb6a0002aa0}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7fb6abb9b4a0 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7fb6abb98620 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6abd0a580 <QObject::staticMetaObject>}, stringdata = 0x7fb6abb702e0 <_ZL29qt_meta_stringdata_QEventLoop.lto_priv.0>, data = 0x7fb6abb70280 <_ZL23qt_meta_data_QEventLoop.lto_priv.0>, static_metacall = 0x7fb6aba84720 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
#35 0x00007fb6abf3a0e2 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1870
#36 0x00007fb6ab176f2a in QApplication::exec() () at kernel/qapplication.cpp:2829
#37 0x000055feddf95e4d in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin/kwin-5.26.0/src/main_x11.cpp:409
        format = {d = 0x55fedea3add0}

                  a = {<KWin::Application> = {<QApplication> = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x55fede0743d8 <vtable for KWin::ApplicationX11+16>, static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7fb6abb74920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7fb6abb74800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7fb6ababe350 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x55fedea3ae20}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7fb6abb9b4a0 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7fb6abb98620 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6abd0a580 <QObject::staticMetaObject>}, stringdata = 0x7fb6abb70060 <_ZL35qt_meta_stringdata_QCoreApplication.lto_priv.0>, data = 0x7fb6abb6ff40 <_ZL29qt_meta_data_QCoreApplication.lto_priv.0>, static_metacall = 0x7fb6aba90000 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7ffc7bf5e210}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6abd0f3a0 <QCoreApplication::staticMetaObject>}, stringdata = 0x7fb6ac35a720 <_ZL34qt_meta_stringdata_QGuiApplication.lto_priv.0>, data = 0x7fb6ac35a4a0 <_ZL28qt_meta_data_QGuiApplication.lto_priv.0>, static_metacall = 0x7fb6abf4b780 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6ac446e80 <QGuiApplication::staticMetaObject>}, stringdata = 0x7fb6ab5468e0 <_ZL31qt_meta_stringdata_QApplication.lto_priv.0>, data = 0x7fb6ab546760 <_ZL25qt_meta_data_QApplication.lto_priv.0>, static_metacall = 0x7fb6ab17a3f0 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6ab6835e0 <QApplication::staticMetaObject>}, stringdata = 0x7fb6ad6637a0 <_ZL36qt_meta_stringdata_KWin__Application.lto_priv.0>, data = 0x7fb6ad65df60 <_ZL30qt_meta_data_KWin__Application.lto_priv.0>, static_metacall = 0x7fb6ad371c00 <KWin::Application::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, m_eventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic<int> = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x55fedeec9f90}, d = 0x55fedeec9f90}}, m_genericEventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic<int> = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x7fb6abb75e90 <QListData::shared_null>}, d = 0x7fb6abb75e90 <QListData::shared_null>}}, m_eventFilter = std::unique_ptr<class KWin::XcbEventFilter> = {get() = 0x55fedecf1560}, m_configLock = false, m_config = {d = 0x55fedec45fc0}, m_kxkbConfig = {d = 0x7fb698002cf0}, m_operationMode = KWin::Application::OperationModeX11, m_x11Time = 8372968, m_rootWindow = 476, m_connection = 0x55fedea475d0, m_useKActivities = true, m_session = std::unique_ptr<class KWin::Session> = {get() = 0x55fedecec7a0}, m_platform = std::unique_ptr<class KWin::Platform> = {get() = 0x55fedecc60a0}, m_terminating = false, m_xwaylandScale = 1, m_processEnvironment = {d = {d = 0x0}}, m_pluginManager = std::unique_ptr<class KWin::PluginManager> = {get() = 0x0}, m_inputMethod = std::unique_ptr<class KWin::InputMethod> = {get() = 0x0}, m_colorManager = std::unique_ptr<class KWin::ColorManager> = {get() = 0x0}, m_tabletModeManager = std::unique_ptr<class KWin::TabletModeManager> = {get() = 0x7fb698002e90}, m_screenLockerWatcher = std::unique_ptr<class KWin::ScreenLockerWatcher> = {get() = 0x7fb698007d30}}, static staticMetaObject = {d = {superdata = {direct = 0x7fb6ad782780 <KWin::Application::staticMetaObject>}, stringdata = 0x55fede038800 <qt_meta_stringdata_KWin__ApplicationX11>, data = 0x55fede037d00 <qt_meta_data_KWin__ApplicationX11>, static_metacall = 0x55feddf97e80 <KWin::ApplicationX11::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, owner = std::unique_ptr<class KWin::KWinSelectionOwner> = {get() = 0x7fb698002af0}, m_replace = false}
        replaceOption = {d = {d = 0x55fedea3ab60}}
        parser = {d = 0x55fedeccaee0}
        noActivitiesOption = {d = {d = 0x55fedecefec0}}

Here, if I look at the instruction that triggers the crash, it's :
(gdb) disas
Dump of assembler code for function _ZNK4KWin6Output5scaleEv:
   0x00007fb6ad3aa430 <+0>:     endbr64
=> 0x00007fb6ad3aa434 <+4>:     movsd  0x20(%rdi),%xmm0
   0x00007fb6ad3aa439 <+9>:     ret

(gdb) print $rdi
$1 = 0

And this time, the sequence of events is:
XcbWindowManager::eventLoop() begin
XCB_MAP_NOTIFY: 75497472
XCB_EXPOSE:1024x768 0,0 sequence: 8 window: 75497472
XCB_*: response_type: 7
XCB_*: response_type: 8
XCB_EXPOSE:1024x679 0,89 sequence: 11 window: 75497472
XCB_EXPOSE: show: 0000555555761E20 1024 x 679 window: 75497472 exposed(): 1


The code that creates the window is pretty basic.

if((width == 0) && (height == 0))
    {
        width = 1024;
        height = 768;
    }
    
    xcb_window_t window = xcb_generate_id(_connection);

    uint32_t value_mask = /*XCB_CW_BACK_PIXEL |*/ XCB_CW_EVENT_MASK;
    uint32_t value_list[4];

    value_list[0] = XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_KEY_RELEASE |
                    XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
                    XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_LEAVE_WINDOW |
                    XCB_EVENT_MASK_POINTER_MOTION |XCB_EVENT_MASK_FOCUS_CHANGE |
                    XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY;
    value_list[1] = 0;//_screen->black_pixel;
    value_list[2] = 0;

    xcb_void_cookie_t xcbcookie = xcb_create_window_checked(_connection, XCB_COPY_FROM_PARENT, window, _screen->root, 0, 0, width, height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
                      _screen->root_visual, value_mask, value_list);

    xcb_generic_error_t* err = xcb_request_check(_connection, xcbcookie);
    if(err != nullptr)
    {
        Log::err << "xcb_create_window failed" << endl;
        throw std::runtime_error("xcb_create_window");
    }

    xcb_intern_atom_cookie_t cookie = xcb_intern_atom(_connection, 1, 12, "WM_PROTOCOLS");
    xcb_intern_atom_reply_t* reply = xcb_intern_atom_reply(_connection, cookie, 0);

    xcbcookie = xcb_change_property_checked(_connection, XCB_PROP_MODE_REPLACE, window, (*reply).atom, 4, 32, 1, &(*_delete_window_atom).atom);

    err = xcb_request_check(_connection, xcbcookie);
    if(err != nullptr)
    {
        Log::err << "xcb_change_property failed" << endl;
        throw std::runtime_error("xcb_change_property");
    }

    free(reply);

    auto xcbwindowp = new XcbWindow(*this, window, width, height);

    xcbcookie = xcb_map_window_checked(_connection, window);
    err = xcb_request_check(_connection, xcbcookie);
    if(err != nullptr)
    {
        delete xcbwindowp;

        Log::err << "xcb_map_window failed" << endl;
        throw std::runtime_error("xcb_map_window");
    }

    _window_list.emplace_back(xcbwindowp);

    xcb_flush(_connection);

    xcb_size_hints_t hints;
    xcb_icccm_size_hints_set_min_size(&hints, width, height);
    xcb_icccm_size_hints_set_max_size(&hints, width, width);
    xcbcookie = xcb_icccm_set_wm_size_hints_checked(_connection, window, XCB_ATOM_WM_NORMAL_HINTS, &hints);

    err = xcb_request_check(_connection, xcbcookie);
    if(err != nullptr)
    {
        _window_list.remove(xcbwindowp);
        delete xcbwindowp;

        Log::err << "xcb_icccm_set_wm_size_hints failed" << endl;
        throw std::runtime_error("xcb_icccm_set_wm_size_hints");
    }
    
    xcb_flush(_connection);

    while(!xcbwindowp->exposed()) // NOTE: when the window is exposed, the flag is changed by the event loop. The kwin_x11 often crashes before reaching this point.
    {
        Thread::sleep(500);
    }

The event loop is pretty minor and mostly dump the events and frees the memory.

Finally, I've kept the output of /usr/bin/kwin_x11 --replace and crashed it immediately:

kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.utf-8" (mapped to "en_US.utf-8")
kwin_xkbcommon: XKB: inet:323:58: unrecognized keysym "XF86EmojiPicker"
kwin_xkbcommon: XKB: inet:324:58: unrecognized keysym "XF86Dictate"
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 1701, resource id: 77594658, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1702, resource id: 77594658, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 1711, resource id: 77594662, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1712, resource id: 77594662, major code: 14 (GetGeometry), minor code: 0
Application::crashHandler() called with signal 11; recent crashes: 1
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin_x11 path = /usr/bin pid = 11114
KCrash: Arguments: /usr/bin/kwin_x11 --replace 
KCrash: Attempting to start /usr/lib/drkonqi
kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.utf-8" (mapped to "en_US.utf-8")
kwin_xkbcommon: XKB: inet:323:58: unrecognized keysym "XF86EmojiPicker"
kwin_xkbcommon: XKB: inet:324:58: unrecognized keysym "XF86Dictate"
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 77594637, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 77594637, major code: 20 (GetProperty), minor code: 0
QSocketNotifier: Invalid socket 4 with type Read, disabling...
QSocketNotifier: Invalid socket 9 with type Read, disabling...
QSocketNotifier: Invalid socket 26 with type Read, disabling...
Application::crashHandler() called with signal 11; recent crashes: 2
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin_x11 path = /usr/bin pid = 11182
KCrash: Arguments: /usr/bin/kwin_x11 --crashes 1 
KCrash: Attempting to start /usr/lib/drkonqi
kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.utf-8" (mapped to "en_US.utf-8")
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 88080397, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 88080397, major code: 20 (GetProperty), minor code: 0
kwin_xkbcommon: XKB: inet:323:58: unrecognized keysym "XF86EmojiPicker"
kwin_xkbcommon: XKB: inet:324:58: unrecognized keysym "XF86Dictate"
QSocketNotifier: Invalid socket 28 with type Read, disabling...
QSocketNotifier: Invalid socket 9 with type Read, disabling...
QSocketNotifier: Invalid socket 4 with type Read, disabling...
Application::crashHandler() called with signal 11; recent crashes: 3
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin_x11 path = /usr/bin pid = 11191
KCrash: Arguments: /usr/bin/kwin_x11 --crashes 2 
KCrash: Attempting to start /usr/lib/drkonqi
kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.utf-8" (mapped to "en_US.utf-8")
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 90177549, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 90177549, major code: 20 (GetProperty), minor code: 0
kwin_xkbcommon: XKB: inet:323:58: unrecognized keysym "XF86EmojiPicker"
kwin_xkbcommon: XKB: inet:324:58: unrecognized keysym "XF86Dictate"
QSocketNotifier: Invalid socket 4 with type Read, disabling...
QSocketNotifier: Invalid socket 9 with type Read, disabling...
QSocketNotifier: Invalid socket 30 with type Read, disabling...
Application::crashHandler() called with signal 11; recent crashes: 4
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = kwin_x11 path = /usr/bin pid = 11200
KCrash: Arguments: /usr/bin/kwin_x11 --crashes 3 
KCrash: Attempting to start /usr/lib/drkonqi
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 92274701, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 92274701, major code: 20 (GetProperty), minor code: 0
kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.utf-8" (mapped to "en_US.utf-8")
kwin_xkbcommon: XKB: inet:323:58: unrecognized keysym "XF86EmojiPicker"
kwin_xkbcommon: XKB: inet:324:58: unrecognized keysym "XF86Dictate"
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 1694, resource id: 75497506, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1695, resource id: 75497506, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 1704, resource id: 75497510, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1705, resource id: 75497510, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 3865, resource id: 41943817, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4123, resource id: 75497534, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4291, resource id: 83886090, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4295, resource id: 81788938, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4299, resource id: 79691786, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4303, resource id: 73400330, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 4314, resource id: 41943818, major code: 18 (ChangeProperty), minor code: 0

That's all I can think of.