Hi

It seems that kwin_wayland crash again. Below is the full stack trace

```
#0  KWin::DrmBuffer::modifier (this=0x0) at /srcbuild/kwin/src/backends/drm/drm_buffer.cpp:55
No locals.
#1  0x00007f983fccdb53 in KWin::DrmPipeline::pruneModifier (this=this@entry=0x560c11004030)
    at /opt/include/QtCore/qsharedpointer_impl.h:301
        modifiers = <optimized out>
#2  0x00007f983fcc6f92 in KWin::DrmGpu::checkCrtcAssignment (this=this@entry=0x560c10ecfd20, connectors=..., crtcs=...)
    at /srcbuild/kwin/src/backends/drm/drm_gpu.cpp:379
        crtcsLeft = {d = 0x560c114afa20}
        id = <optimized out>
        it = 0x7fff08fe53f0
        __PRETTY_FUNCTION__ = "bool KWin::DrmGpu::checkCrtcAssignment(QVector<KWin::DrmConnector*>, const QVector<KWin::DrmCrtc*>&)"
        connector = 0x560c114aace0
        pipeline = 0x560c11004030
        currentCrtc = 0x560c10f56690
#3  0x00007f983fcc7238 in KWin::DrmGpu::testPendingConfiguration (this=this@entry=0x560c10ecfd20)
    at /srcbuild/kwin/src/backends/drm/drm_gpu.cpp:419
        connectors = {d = 0x560c114af980}
        crtcs = {d = 0x560c10f4c9f0}
#4  0x00007f983fcc87e7 in KWin::DrmGpu::updateOutputs (this=this@entry=0x560c10ecfd20)
    at /srcbuild/kwin/src/backends/drm/drm_gpu.cpp:319
        resources = {d = <optimized out>}
        __PRETTY_FUNCTION__ = "bool KWin::DrmGpu::updateOutputs()"
        lessees = <optimized out>
        addedOutputs = {d = 0x560c114abb80}
        removedConnectors = {d = 0x7f98469fb720 <QArrayData::shared_null>}
#5  0x00007f983fcb8246 in KWin::DrmBackend::updateOutputs (this=0x560c10e8b970)
    at /srcbuild/kwin/src/backends/drm/drm_backend.cpp:316
        gpu = 0x560c10ecfd20
        it = 0x560c10f3edf8
        oldOutputs = {d = 0x7f98469fb720 <QArrayData::shared_null>}
        __PRETTY_FUNCTION__ = "void KWin::DrmBackend::updateOutputs()"
#6  0x00007f984699940e in ?? () from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#7  0x00007f9847d193a9 in KWin::Compositor::setupStart (this=0x560c10fb4070) at /srcbuild/kwin/src/composite.cpp:324
        supportedCompositors = {d = 0x560c10fb2d80}
        userConfigIt = 0x560c10fb2d98
        __PRETTY_FUNCTION__ = {<optimized out> <repeats 36 times>}
#8  0x00007f9847d193f1 in KWin::WaylandCompositor::start (this=0x560c10fb4070) at /srcbuild/kwin/src/composite.cpp:764
No locals.
#9  0x00007f98469927f4 in QObject::event(QEvent*) () from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#10 0x00007f98460910dd in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /opt/lib/x86_64-linux-gnu/libQt5Widgets.so.5
No symbol table info available.
#11 0x00007f984697bf62 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#12 0x00007f984697c1c9 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#13 0x00007f98469aaf84 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#14 0x0000560c0f0dc088 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
No symbol table info available.
#15 0x00007f9846979afa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#16 0x00007f984697dcd1 in QCoreApplication::exec() () from /opt/lib/x86_64-linux-gnu/libQt5Core.so.5
No symbol table info available.
#17 0x0000560c0f03f1e2 in main (argc=<optimized out>, argv=<optimized out>) at /srcbuild/kwin/src/main_wayland.cpp:657
        environment = {d = {d = 0x560c10e533c0}}
        a = {<KWin::ApplicationWaylandAbstract> = {<KWin::Application> = {<QApplication> = {<No data fields>}, 
              static staticMetaObject = {d = {superdata = {direct = 0x7f9846432f60 <QApplication::staticMetaObject>}, 
                  stringdata = 0x7f9847eeda20 <qt_meta_stringdata_KWin__Application>, 
                  data = 0x7f9847eed8c0 <qt_meta_data_KWin__Application>, 
                  static_metacall = 0x7f9847cf859a <KWin::Application::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static crashes = 0, 
              m_eventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {p = {
                    static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, 
                              _M_i = -1}, static is_always_lock_free = true}}}, alloc = 0, begin = 0, end = 0, array = {
                        0x0}}, d = 0x7f98469fc1d0 <QListData::shared_null>}, d = 0x7f98469fc1d0 <QListData::shared_null>}}, 
              m_genericEventFilters = {<QListSpecialMethods<QPointer<KWin::X11EventFilterContainer> >> = {<No data fields>}, {
                  p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {
                              static _S_alignment = 4, _M_i = -1}, static is_always_lock_free = true}}}, alloc = 0, 
                      begin = 0, end = 0, array = {0x0}}, d = 0x7f98469fc1d0 <QListData::shared_null>}, 
                  d = 0x7f98469fc1d0 <QListData::shared_null>}}, m_eventFilter = {d = 0x560c10e7bd00}, m_configLock = false, 
              m_config = {d = 0x560c10ec6c70}, m_kxkbConfig = {d = 0x560c10ec6870}, 
              m_operationMode = KWin::Application::OperationModeXwayland, m_x11Time = 0, m_rootWindow = 0, 
              m_connection = 0x0, m_defaultScreen = 0x0, m_useKActivities = true, m_platform = 0x560c10e8b970, 
              m_terminating = false, m_isClosingX11Connection = false}, static staticMetaObject = {d = {superdata = {
                  direct = 0x7f9848031d80 <KWin::Application::staticMetaObject>}, 
                stringdata = 0x7f9847eed880 <qt_meta_stringdata_KWin__ApplicationWaylandAbstract>, 
                data = 0x7f9847eed840 <qt_meta_data_KWin__ApplicationWaylandAbstract>, 
                static_metacall = 0x7f9847cf73c8 <KWin::ApplicationWaylandAbstract::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {
                direct = 0x7f9848031d40 <KWin::ApplicationWaylandAbstract::staticMetaObject>}, 
              stringdata = 0x560c0f0de2e0 <qt_meta_stringdata_KWin__ApplicationWayland>, 
              data = 0x560c0f0de2a0 <qt_meta_data_KWin__ApplicationWayland>, 
              static_metacall = 0x560c0f040916 <KWin::ApplicationWayland::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, m_startXWayland = true, 
          m_applicationsToStart = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {
                  static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, 
                            _M_i = -1}, static is_always_lock_free = true}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, 
                  d = 0x7f98469fc1d0 <QListData::shared_null>}, 
                d = 0x7f98469fc1d0 <QListData::shared_null>}}, <No data fields>}, m_inputMethodServerToStart = {
            static null = {<No data fields>}, d = 0x7f98469fb720 <QArrayData::shared_null>}, m_environment = {d = {
              d = 0x560c10e533c0}}, m_sessionArgument = {static null = {<No data fields>}, 
            d = 0x7f98469fb720 <QArrayData::shared_null>}, m_xwayland = 0x0, m_xwaylandListenFds = {d = 0x7f983800f710}, 
          m_xwaylandDisplay = {static null = {<No data fields>}, d = 0x560c10e8b640}, m_xwaylandXauthority = {
            static null = {<No data fields>}, d = 0x560c10e8b0d0}, m_settingsWatcher = {value = 0x0, d = 0x0}}
        availablePlugins = {d = 0x560c10e7d260}
        hasPlugin = {__availablePlugins = @0x7fff08fe5b08}
        hasSizeOption = <optimized out>
        hasOutputCountOption = 8
        hasX11Option = true
        hasVirtualOption = true
        hasWaylandOption = true
        hasDrmOption = <optimized out>
        xwaylandOption = {d = {d = 0x560c10e8d900}}
        waylandSocketOption = {d = {d = 0x560c10e7c890}}
        x11DisplayOption = {d = {d = 0x560c10e8ebf0}}
        waylandDisplayOption = {d = {d = 0x560c10e8ea70}}
        virtualFbOption = {d = {d = 0x560c10e92550}}
        widthOption = {d = {d = 0x560c10eb3840}}
        heightOption = {d = {d = 0x560c10e8eab0}}
        scaleOption = {d = {d = 0x560c10e8ec30}}
        outputCountOption = {d = {d = 0x560c10e92590}}
        waylandSocketFdOption = {d = {d = 0x560c10e61c60}}
        xwaylandListenFdOption = {d = {d = 0x560c10e8e830}}
        xwaylandDisplayOption = {d = {d = 0x560c10e9c820}}
        xwaylandXAuthorityOption = {d = {d = 0x560c10eb38b0}}
        replaceOption = {d = {d = 0x560c10eb3920}}
        parser = {d = 0x560c10e6bc50}
        drmOption = {d = {d = 0x560c10e8ad50}}
        inputMethodOption = {d = {d = 0x560c10e8adf0}}
        listBackendsOption = {d = {d = 0x560c10e8af50}}
        screenLockerOption = {d = {d = 0x560c10e8aff0}}
        noScreenLockerOption = {d = {d = 0x560c10e8b090}}
        noGlobalShortcutsOption = {d = {d = 0x560c10e8b190}}
        noActivitiesOption = {d = {d = 0x560c10e8b230}}
        exitWithSessionOption = {d = {d = 0x560c10e8b340}}
        pluginName = {static null = {<No data fields>}, 
          d = 0x560c0f0df9a0 <KWin::s_drmPlugin::{lambda()#1}::operator()() const::qstring_literal>}
        initialWindowSize = {wd = <optimized out>, ht = <optimized out>}
        deviceIdentifier = {d = 0x7f98469fb720 <QArrayData::shared_null>}
        outputCount = 150887312
        outputScale = <optimized out>
        pluginIt = 0x7fff08fe5c08
        server = <optimized out>
        flags = {i = 150887416}
        socketName = {static null = {<No data fields>}, d = 0x560c10e8b550}
```

Thanks