KDE Plasma crashing on X11 after 555.58 update

Graphics / Linux Linux
1

Hello,

Since the Nvidia 555.58 update, KDE Plasma won’t launch (from SDDM) on X11 : both screens are black with mouse cursor visible, and some glitchy window frame “Crash Handler” appear randomly for a very brief moment.

What I’ve tried and did not work :

  • Disconnect one or the other of my two display (HDMI and DVI)
  • Delete temporarily my KDE Plasma configuration files
  • Create a new user with fresh KDE Plasma config
  • Launch KDE Plasma from another display manager (LightDM)
  • Add / remove / change various Nvidia kernel module parameters

What I’ve tried and works :

  • Rollback the Nvidia driver to the previous version (550)
  • Launching KDE Plasma on Wayland
  • Launching another DE (Xfce4) on X11

Here is how my journal looks when KDE X11 is crashing on launch :

juil. 03 20:55:50 jeanine systemd[696]: Starting KDE Window Manager...
juil. 03 20:55:51 jeanine kwin_x11[911]: kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.UTF8" (mapped to "en_US.UTF8")
juil. 03 20:55:52 jeanine systemd[696]: Started KDE Window Manager.
juil. 03 20:55:55 jeanine kwin_x11[911]: kwin_scene_opengl: 0x505: GL_OUT_OF_MEMORY error generated. Failed to allocate memory for buffer object.
juil. 03 20:55:55 jeanine kwin_x11[911]: Application::crashHandler() called with signal 11; recent crashes: 1
juil. 03 20:55:56 jeanine kwin_x11[911]: KCrash: appFilePath points to nullptr!
juil. 03 20:55:56 jeanine kwin_x11[911]: KCrash: Application '<unknown>' crashing... crashRecursionCounter = 2
juil. 03 20:55:56 jeanine systemd-coredump[1446]: [🡕] Process 911 (kwin_x11) of user 1000 dumped core.
    
    Stack trace of thread 911:
    #0  0x00007d025e2a8e44 n/a (libc.so.6 + 0x94e44)
    #1  0x00007d025e250a30 raise (libc.so.6 + 0x3ca30)
    #2  0x00007d02619ff643 _ZN6KCrash19defaultCrashHandlerEi (libKF6Crash.so.6 + 0x6643)
    #3  0x00007d025e250ae0 n/a (libc.so.6 + 0x3cae0)
    #4  0x00007d0255146339 n/a (libnvidia-glcore.so.555.58.02 + 0xb46339)
    #5  0x00007d025509276a n/a (libnvidia-glcore.so.555.58.02 + 0xa9276a)
    #6  0x00007d0255093d7c n/a (libnvidia-glcore.so.555.58.02 + 0xa93d7c)
    #7  0x00007d0254daa7bd n/a (libnvidia-glcore.so.555.58.02 + 0x7aa7bd)
    #8  0x00007d026146be86 _ZN4KWin14GLVertexBuffer10endOfFrameEv (libkwin.so.6 + 0x26be86)
    #9  0x00007d02614c10a2 _ZN4KWin18ItemRendererOpenGL8endFrameEv (libkwin.so.6 + 0x2c10a2)
    #10 0x00007d02614cdd66 _ZN4KWin14WorkspaceScene5paintERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x2cdd66)
    #11 0x00007d02614bf585 _ZN4KWin13SceneDelegate5paintERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x2bf585)
    #12 0x00007d0261365fa7 _ZN4KWin10Compositor9paintPassEPNS_11RenderLayerERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x165fa7)
    #13 0x00007d02615b01ae _ZN4KWin13X11Compositor9compositeEPNS_10RenderLoopE (libkwin.so.6 + 0x3b01ae)
    #14 0x00007d025e9a16f7 n/a (libQt6Core.so.6 + 0x1a16f7)
    #15 0x00007d026137ca45 _ZN4KWin10RenderLoop14frameRequestedEPS0_ (libkwin.so.6 + 0x17ca45)
    #16 0x00007d0261383a93 _ZN4KWin17RenderLoopPrivate8dispatchEv (libkwin.so.6 + 0x183a93)
    #17 0x00007d025e9a16f7 n/a (libQt6Core.so.6 + 0x1a16f7)
    #18 0x00007d025e9a9885 _ZN6QTimer10timerEventEP11QTimerEvent (libQt6Core.so.6 + 0x1a9885)
    #19 0x00007d025e98bfc9 _ZN7QObject5eventEP6QEvent (libQt6Core.so.6 + 0x18bfc9)
    #20 0x00007d025f8fc51c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0xfc51c)
    #21 0x00007d025e944d28 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x144d28)
    #22 0x00007d025eac3c98 _ZN14QTimerInfoList14activateTimersEv (libQt6Core.so.6 + 0x2c3c98)
    #23 0x00007d025eba4979 n/a (libQt6Core.so.6 + 0x3a4979)
    #24 0x00007d025d70ea89 n/a (libglib-2.0.so.0 + 0x5ca89)
    #25 0x00007d025d7709b7 n/a (libglib-2.0.so.0 + 0xbe9b7)
    #26 0x00007d025d70df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
    #27 0x00007d025eba2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
    #28 0x00007d025e94f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
    #29 0x00007d025e94934d _ZN16QCoreApplication4execEv (libQt6Core.so.6 + 0x14934d)
    #30 0x00005f9d5d112e2b n/a (kwin_x11 + 0x39e2b)
    #31 0x00007d025e239c88 n/a (libc.so.6 + 0x25c88)
    #32 0x00007d025e239d4c __libc_start_main (libc.so.6 + 0x25d4c)
    #33 0x00005f9d5d116a55 n/a (kwin_x11 + 0x3da55)
    
    Stack trace of thread 1283:
    #0  0x00007d025e31c39d __poll (libc.so.6 + 0x10839d)
    #1  0x00007d025d7708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
    #2  0x00007d025d70df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
    #3  0x00007d025eba2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
    #4  0x00007d025e94f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
    #5  0x00007d025ea3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
    #6  0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #7  0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #8  0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    
    Stack trace of thread 1080:
    #0  0x00007d025e31c39d __poll (libc.so.6 + 0x10839d)
    #1  0x00007d025d7708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
    #2  0x00007d025d70df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
    #3  0x00007d025eba2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
    #4  0x00007d025e94f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
    #5  0x00007d025ea3a410 _ZN7QThread4execEv (libQt6Core.so.6 + 0x23a410)
    #6  0x00007d025ff99e4e n/a (libQt6DBus.so.6 + 0x2de4e)
    #7  0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #8  0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #9  0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    
    Stack trace of thread 1325:
    #0  0x00007d025e31c39d __poll (libc.so.6 + 0x10839d)
    #1  0x00007d025d7708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
    #2  0x00007d025d70df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
    #3  0x00007d025eba2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
    #4  0x00007d025e94f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
    #5  0x00007d025ea3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
    #6  0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #7  0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #8  0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    
    Stack trace of thread 1108:
    #0  0x00007d025e31c39d __poll (libc.so.6 + 0x10839d)
    #1  0x00007d0261a6e20b n/a (libxcb.so.1 + 0xd20b)
    #2  0x00007d0261a6ff3d xcb_wait_for_event (libxcb.so.1 + 0xef3d)
    #3  0x00007d0257fae761 n/a (libQt6XcbQpa.so.6 + 0x4e761)
    #4  0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #5  0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #6  0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    
    Stack trace of thread 1243:
    #0  0x00007d025e2a34e9 n/a (libc.so.6 + 0x8f4e9)
    #1  0x00007d025e2a5ed9 pthread_cond_wait (libc.so.6 + 0x91ed9)
    #2  0x00007d025eace120 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2ce120)
    #3  0x00007d026064a264 n/a (libQt6Qml.so.6 + 0x24a264)
    #4  0x00007d02606f54f5 n/a (libQt6Qml.so.6 + 0x2f54f5)
    #5  0x00007d02606f5848 n/a (libQt6Qml.so.6 + 0x2f5848)
    #6  0x00007d02606acf79 _ZN11QQmlImports15importExtensionERK7QString13QTypeRevisionP18QQmlImportDatabasePK27QQmlTypeLoaderQmldirContentP5QListI9QQmlErrorE (libQ>
    #7  0x00007d02606b10bd _ZN11QQmlImports16addLibraryImportEP18QQmlImportDatabaseRK7QStringS4_13QTypeRevisionS4_S4_6QFlagsINS_10ImportFlagEEtP5QListI9QQmlErrorE >
    #8  0x00007d02607532d8 n/a (libQt6Qml.so.6 + 0x3532d8)
    #9  0x00007d02607590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
    #10 0x00007d026075aeeb _ZN14QQmlTypeLoader4Blob20loadDependentImportsERK5QListIN13QQmlDirParser6ImportEERK7QString13QTypeRevisiont6QFlagsIN11QQmlImports10Impor>
    #11 0x00007d026075d728 _ZN14QQmlTypeLoader4Blob22loadImportDependenciesERKSt10shared_ptrINS0_13PendingImportEERK7QString6QFlagsIN11QQmlImports10ImportFlagEEP5Q>
    #12 0x00007d0260753301 n/a (libQt6Qml.so.6 + 0x353301)
    #13 0x00007d02607590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
    #14 0x00007d026075aeeb _ZN14QQmlTypeLoader4Blob20loadDependentImportsERK5QListIN13QQmlDirParser6ImportEERK7QString13QTypeRevisiont6QFlagsIN11QQmlImports10Impor>
    #15 0x00007d026075d728 _ZN14QQmlTypeLoader4Blob22loadImportDependenciesERKSt10shared_ptrINS0_13PendingImportEERK7QString6QFlagsIN11QQmlImports10ImportFlagEEP5Q>
    #16 0x00007d0260753301 n/a (libQt6Qml.so.6 + 0x353301)
    #17 0x00007d02607590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
    #18 0x00007d026075a969 _ZN14QQmlTypeLoader4Blob9addImportEPKN3QV412CompiledData6ImportE6QFlagsIN11QQmlImports10ImportFlagEEP5QListI9QQmlErrorE (libQt6Qml.so.6 >
    #19 0x00007d02607449ab n/a (libQt6Qml.so.6 + 0x3449ab)
    #20 0x00007d026074dbe5 _ZN14QQmlTypeLoader7setDataERK14QQmlRefPointerI12QQmlDataBlobERKNS1_14SourceCodeDataE (libQt6Qml.so.6 + 0x34dbe5)
    #21 0x00007d026074e90c _ZN14QQmlTypeLoader7setDataERK14QQmlRefPointerI12QQmlDataBlobERK7QString (libQt6Qml.so.6 + 0x34e90c)
    #22 0x00007d0260751a8d _ZN14QQmlTypeLoader10loadThreadERK14QQmlRefPointerI12QQmlDataBlobE (libQt6Qml.so.6 + 0x351a8d)
    #23 0x00007d026075e1fc n/a (libQt6Qml.so.6 + 0x35e1fc)
    #24 0x00007d026064adc4 n/a (libQt6Qml.so.6 + 0x24adc4)
    #25 0x00007d025f8fc51c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0xfc51c)
    #26 0x00007d025e944d28 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x144d28)
    #27 0x00007d025e9450eb _ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData (libQt6Core.so.6 + 0x1450eb)
    #28 0x00007d025eba49ec n/a (libQt6Core.so.6 + 0x3a49ec)
    #29 0x00007d025d70ea89 n/a (libglib-2.0.so.0 + 0x5ca89)
    #30 0x00007d025d7709b7 n/a (libglib-2.0.so.0 + 0xbe9b7)
    #31 0x00007d025d70df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
    #32 0x00007d025eba2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
    #33 0x00007d025e94f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
    #34 0x00007d025ea3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
    #35 0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #36 0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #37 0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    
    Stack trace of thread 1326:
    #0  0x00007d025e2a34e9 n/a (libc.so.6 + 0x8f4e9)
    #1  0x00007d025e2a6242 pthread_cond_timedwait (libc.so.6 + 0x92242)
    #2  0x00007d025eace0b8 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2ce0b8)
    #3  0x00007d025eac7db2 n/a (libQt6Core.so.6 + 0x2c7db2)
    #4  0x00007d025eac9747 n/a (libQt6Core.so.6 + 0x2c9747)
    #5  0x00007d025e2a6ded n/a (libc.so.6 + 0x92ded)
    #6  0x00007d025e32a0dc n/a (libc.so.6 + 0x1160dc)
    ELF object binary architecture: AMD x86-64
juil. 03 20:55:56 jeanine systemd[696]: plasma-kwin_x11.service: Main process exited, code=dumped, status=11/SEGV
juil. 03 20:55:56 jeanine systemd[696]: plasma-kwin_x11.service: Failed with result 'core-dump'.
juil. 03 20:55:56 jeanine systemd[696]: plasma-kwin_x11.service: Scheduled restart job, restart counter is at 1.
juil. 03 20:55:56 jeanine systemd[696]: Starting KDE Window Manager...
juil. 03 20:55:57 jeanine kwin_x11[1527]: kwin_xkbcommon: XKB: couldn't find a Compose file for locale "en_US.UTF8" (mapped to "en_US.UTF8")
juil. 03 20:55:57 jeanine systemd[696]: Started KDE Window Manager.
juil. 03 20:56:11 jeanine kwin_x11[1527]: The X11 connection broke (error 1). Did the X11 server die?
juil. 03 20:56:11 jeanine systemd[696]: plasma-kwin_x11.service: Main process exited, code=exited, status=1/FAILURE
juil. 03 20:56:11 jeanine systemd[696]: plasma-kwin_x11.service: Failed with result 'exit-code'.
juil. 03 20:56:11 jeanine systemd[696]: Stopped KDE Window Manager.

Here are my specs :

OS: Arch Linux
Kernel: 6.9.7-arch1-1
DE: Plasma 6.1.1
WM: kwin
DM: SDDM
CPU: Intel i5-9400F
GPU: NVIDIA GeForce GTX 1070 Ti
GPU Driver: NVIDIA 555.58.02
Displays: 2 (1 HDMI and 1 DVI)

This bug has been reported by a few people on the KDE forums : https://discuss.kde.org/t/x11-session-not-working-anymore-after-latest-updates-on-arch/18001

And a KDE bug report has been created here : https://bugs.kde.org/show_bug.cgi?id=489695

However since it seems to be related to the driver update I’m posting here.

Regards

2

Similar issues as above - I’ve tried running 555.58.02 twice now and had the same experience. A couple of additional notes on my setup:
I have a dual NVIDIA card setup
GPU1 - NVIDIA GeForce GTX 1070 Ti - Main Arch display on two 4K monitors
GPU2 - NVIDIA GeForce RTX 3080 - Used for vfio so driver is not loaded at boot. Config available if requested - This GPU is passed through to my Windows 10 VM

Here’s the journal output when I attempt to log into X11 KDE Plasma session right after driver upgrade to 555.58.02 after a reboot. As noted above Wayland appears to work ‘fine’

Ghosthostii systemd[1272]: Starting KDE Window Manager...
 Ghosthostii systemd[1272]: Started KDE Window Manager.
 Ghosthostii kwin_x11[1374]: kwin_scene_opengl: 0x505: GL_OUT_OF_MEMORY error generated. Failed to allocate memory for buffer object.
 Ghosthostii kwin_x11[1374]: Application::crashHandler() called with signal 11; recent crashes: 1
 Ghosthostii kwin_x11[1374]: KCrash: appFilePath points to nullptr!
 Ghosthostii kwin_x11[1374]: KCrash: Application '<unknown>' crashing... crashRecursionCounter = 2
 Ghosthostii systemd-coredump[1801]: [🡕] Process 1374 (kwin_x11) of user 1000 dumped core.
                                                    
                                                    Stack trace of thread 1374:
                                                    #0  0x00007146942a8e44 n/a (libc.so.6 + 0x94e44)
                                                    #1  0x0000714694250a30 raise (libc.so.6 + 0x3ca30)
                                                    #2  0x0000714696fd9643 _ZN6KCrash19defaultCrashHandlerEi (libKF6Crash.so.6 + 0x6643)
                                                    #3  0x0000714694250ae0 n/a (libc.so.6 + 0x3cae0)
                                                    #4  0x0000714686345f99 n/a (libnvidia-glcore.so.555.58 + 0xb45f99)
                                                    #5  0x00007146862926fa n/a (libnvidia-glcore.so.555.58 + 0xa926fa)
                                                    #6  0x0000714686293d0c n/a (libnvidia-glcore.so.555.58 + 0xa93d0c)
                                                    #7  0x0000714685faa7dd n/a (libnvidia-glcore.so.555.58 + 0x7aa7dd)
                                                    #8  0x0000714696a6be86 _ZN4KWin14GLVertexBuffer10endOfFrameEv (libkwin.so.6 + 0x26be86)
                                                    #9  0x0000714696ac10a2 _ZN4KWin18ItemRendererOpenGL8endFrameEv (libkwin.so.6 + 0x2c10a2)
                                                    #10 0x0000714696acdd66 _ZN4KWin14WorkspaceScene5paintERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x2cdd66)
                                                    #11 0x0000714696abf585 _ZN4KWin13SceneDelegate5paintERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x2bf585)
                                                    #12 0x0000714696965fa7 _ZN4KWin10Compositor9paintPassEPNS_11RenderLayerERKNS_12RenderTargetERK7QRegion (libkwin.so.6 + 0x165fa7)
                                                    #13 0x0000714696bb01ae _ZN4KWin13X11Compositor9compositeEPNS_10RenderLoopE (libkwin.so.6 + 0x3b01ae)
                                                    #14 0x0000714693da16f7 n/a (libQt6Core.so.6 + 0x1a16f7)
                                                    #15 0x000071469697ca45 _ZN4KWin10RenderLoop14frameRequestedEPS0_ (libkwin.so.6 + 0x17ca45)
                                                    #16 0x0000714696983a93 _ZN4KWin17RenderLoopPrivate8dispatchEv (libkwin.so.6 + 0x183a93)
                                                    #17 0x0000714693da16f7 n/a (libQt6Core.so.6 + 0x1a16f7)
                                                    #18 0x0000714693da9885 _ZN6QTimer10timerEventEP11QTimerEvent (libQt6Core.so.6 + 0x1a9885)
                                                    #19 0x0000714693d8bfc9 _ZN7QObject5eventEP6QEvent (libQt6Core.so.6 + 0x18bfc9)
                                                    #20 0x0000714694efc51c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0xfc51c)
                                                    #21 0x0000714693d44d28 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x144d28)
                                                    #22 0x0000714693ec3c98 _ZN14QTimerInfoList14activateTimersEv (libQt6Core.so.6 + 0x2c3c98)
                                                    #23 0x0000714693fa4979 n/a (libQt6Core.so.6 + 0x3a4979)
                                                    #24 0x0000714692d0ea89 n/a (libglib-2.0.so.0 + 0x5ca89)
                                                    #25 0x0000714692d709b7 n/a (libglib-2.0.so.0 + 0xbe9b7)
                                                    #26 0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #27 0x0000714693fa2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
                                                    #28 0x0000714693d4f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
                                                    #29 0x0000714693d4934d _ZN16QCoreApplication4execEv (libQt6Core.so.6 + 0x14934d)
                                                    #30 0x000056ecaa89ee2b n/a (kwin_x11 + 0x39e2b)
                                                    #31 0x0000714694239c88 n/a (libc.so.6 + 0x25c88)
                                                    #32 0x0000714694239d4c __libc_start_main (libc.so.6 + 0x25d4c)
                                                    #33 0x000056ecaa8a2a55 n/a (kwin_x11 + 0x3da55)
                                                    
                                                    Stack trace of thread 1511:
                                                    #0  0x000071469431c39d __poll (libc.so.6 + 0x10839d)
                                                    #1  0x0000714692d708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
                                                    #2  0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #3  0x0000714693fa2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
                                                    #4  0x0000714693d4f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
                                                    #5  0x0000714693e3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
                                                    #6  0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #7  0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #8  0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    
                                                    Stack trace of thread 1386:
                                                    #0  0x000071469431c39d __poll (libc.so.6 + 0x10839d)
                                                    #1  0x000071469704820b n/a (libxcb.so.1 + 0xd20b)
                                                    #2  0x0000714697049f3d xcb_wait_for_event (libxcb.so.1 + 0xef3d)
                                                    #3  0x000071468d90b761 n/a (libQt6XcbQpa.so.6 + 0x4e761)
                                                    #4  0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #5  0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #6  0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    
                                                    Stack trace of thread 1504:
                                                    #0  0x00007146942a34e9 n/a (libc.so.6 + 0x8f4e9)
                                                    #1  0x00007146942a5ed9 pthread_cond_wait (libc.so.6 + 0x91ed9)
                                                    #2  0x0000714693ece120 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2ce120)
                                                    #3  0x0000714695c4a264 n/a (libQt6Qml.so.6 + 0x24a264)
                                                    #4  0x0000714695cf54f5 n/a (libQt6Qml.so.6 + 0x2f54f5)
                                                    #5  0x0000714695cf5848 n/a (libQt6Qml.so.6 + 0x2f5848)
                                                    #6  0x0000714695cacf79 _ZN11QQmlImports15importExtensionERK7QString13QTypeRevisionP18QQmlImportDatabasePK27QQmlTypeLoaderQmldirContentP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x2acf79)
                                                    #7  0x0000714695cb10bd _ZN11QQmlImports16addLibraryImportEP18QQmlImportDatabaseRK7QStringS4_13QTypeRevisionS4_S4_6QFlagsINS_10ImportFlagEEtP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x2b10bd)
                                                    #8  0x0000714695d532d8 n/a (libQt6Qml.so.6 + 0x3532d8)
                                                    #9  0x0000714695d590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
                                                    #10 0x0000714695d5aeeb _ZN14QQmlTypeLoader4Blob20loadDependentImportsERK5QListIN13QQmlDirParser6ImportEERK7QString13QTypeRevisiont6QFlagsIN11QQmlImports10ImportFlagEEPS1_I9QQmlErrorE (libQt6Qml.so.6 + 0x35aeeb)
                                                    #11 0x0000714695d5d728 _ZN14QQmlTypeLoader4Blob22loadImportDependenciesERKSt10shared_ptrINS0_13PendingImportEERK7QString6QFlagsIN11QQmlImports10ImportFlagEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x35d728)
                                                    #12 0x0000714695d53301 n/a (libQt6Qml.so.6 + 0x353301)
                                                    #13 0x0000714695d590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
                                                    #14 0x0000714695d5aeeb _ZN14QQmlTypeLoader4Blob20loadDependentImportsERK5QListIN13QQmlDirParser6ImportEERK7QString13QTypeRevisiont6QFlagsIN11QQmlImports10ImportFlagEEPS1_I9QQmlErrorE (libQt6Qml.so.6 + 0x35aeeb)
                                                    #15 0x0000714695d5d728 _ZN14QQmlTypeLoader4Blob22loadImportDependenciesERKSt10shared_ptrINS0_13PendingImportEERK7QString6QFlagsIN11QQmlImports10ImportFlagEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x35d728)
                                                    #16 0x0000714695d53301 n/a (libQt6Qml.so.6 + 0x353301)
                                                    #17 0x0000714695d590e7 _ZN14QQmlTypeLoader4Blob16addLibraryImportERKSt10shared_ptrINS0_13PendingImportEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x3590e7)
                                                    #18 0x0000714695d5a969 _ZN14QQmlTypeLoader4Blob9addImportEPKN3QV412CompiledData6ImportE6QFlagsIN11QQmlImports10ImportFlagEEP5QListI9QQmlErrorE (libQt6Qml.so.6 + 0x35a969)
                                                    #19 0x0000714695d449ab n/a (libQt6Qml.so.6 + 0x3449ab)
                                                    #20 0x0000714695d4dbe5 _ZN14QQmlTypeLoader7setDataERK14QQmlRefPointerI12QQmlDataBlobERKNS1_14SourceCodeDataE (libQt6Qml.so.6 + 0x34dbe5)
                                                    #21 0x0000714695d4e90c _ZN14QQmlTypeLoader7setDataERK14QQmlRefPointerI12QQmlDataBlobERK7QString (libQt6Qml.so.6 + 0x34e90c)
                                                    #22 0x0000714695d51a8d _ZN14QQmlTypeLoader10loadThreadERK14QQmlRefPointerI12QQmlDataBlobE (libQt6Qml.so.6 + 0x351a8d)
                                                    #23 0x0000714695d5e1fc n/a (libQt6Qml.so.6 + 0x35e1fc)
                                                    #24 0x0000714695c4adc4 n/a (libQt6Qml.so.6 + 0x24adc4)
                                                    #25 0x0000714694efc51c _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0xfc51c)
                                                    #26 0x0000714693d44d28 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x144d28)
                                                    #27 0x0000714693d450eb _ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData (libQt6Core.so.6 + 0x1450eb)
                                                    #28 0x0000714693fa49ec n/a (libQt6Core.so.6 + 0x3a49ec)
                                                    #29 0x0000714692d0ea89 n/a (libglib-2.0.so.0 + 0x5ca89)
                                                    #30 0x0000714692d709b7 n/a (libglib-2.0.so.0 + 0xbe9b7)
                                                    #31 0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #30 0x0000714692d709b7 n/a (libglib-2.0.so.0 + 0xbe9b7)
                                                    #31 0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #32 0x0000714693fa2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
                                                    #33 0x0000714693d4f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
                                                    #34 0x0000714693e3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
                                                    #35 0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #36 0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #37 0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    
                                                    Stack trace of thread 1583:
                                                    #0  0x000071469431c39d __poll (libc.so.6 + 0x10839d)
                                                    #1  0x0000714692d708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
                                                    #2  0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #3  0x0000714693fa2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
                                                    #4  0x0000714693d4f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
                                                    #5  0x0000714693e3a560 _ZN7QThread3runEv (libQt6Core.so.6 + 0x23a560)
                                                    #6  0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #7  0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #8  0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    
                                                    Stack trace of thread 1584:
                                                    #0  0x00007146942a34e9 n/a (libc.so.6 + 0x8f4e9)
                                                    #1  0x00007146942a6242 pthread_cond_timedwait (libc.so.6 + 0x92242)
                                                    #2  0x0000714693ece0b8 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2ce0b8)
                                                    #3  0x0000714693ec7db2 n/a (libQt6Core.so.6 + 0x2c7db2)
                                                    #4  0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #5  0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #6  0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    
                                                    Stack trace of thread 1385:
                                                    #0  0x000071469431c39d __poll (libc.so.6 + 0x10839d)
                                                    #1  0x0000714692d708fd n/a (libglib-2.0.so.0 + 0xbe8fd)
                                                    #2  0x0000714692d0df95 g_main_context_iteration (libglib-2.0.so.0 + 0x5bf95)
                                                    #3  0x0000714693fa2cbd _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x3a2cbd)
                                                    #4  0x0000714693d4f01e _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x14f01e)
                                                    #5  0x0000714693e3a410 _ZN7QThread4execEv (libQt6Core.so.6 + 0x23a410)
                                                    #6  0x0000714695599e4e n/a (libQt6DBus.so.6 + 0x2de4e)
                                                    #7  0x0000714693ec9747 n/a (libQt6Core.so.6 + 0x2c9747)
                                                    #8  0x00007146942a6ded n/a (libc.so.6 + 0x92ded)
                                                    #9  0x000071469432a0dc n/a (libc.so.6 + 0x1160dc)
                                                    ELF object binary architecture: AMD x86-64

I was able to successfully revert back to driver version 550.90.07 using downgrade nvidia nvidia-utils nvidia-lts lib32-nvidia-utils and again am able to log into X11 KDE Plasma

Specs are:
OS: EndeavourOS Linux x86_64
Kernel: 6.9.7-arch1-1 and 6.6.36-1-lts
DE: Plasma 6.1.1
WM: KWin
DM: SDDM
Resolution: 3840x2160, 3840x2160
CPU: AMD Ryzen Threadripper 2950X (32) @ 3.500GHz
GPU: NVIDIA GeForce GTX 1070 Ti
GPU: NVIDIA GeForce RTX 3080
Memory: 4613MiB / 64147Mi
Display from the GTX 1070 Ti - One HDMI and Display Port

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Just did a full re-install of my machine (due to other reasons) and core dumps are happening immediately. Now neither Wayland nor X11 are working at all.

:-(