Bug 493291

Summary: Crash using QtQuick software renderer
Product: [Plasma] kwin Reporter: kammah
Component: tabboxAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: cwo.kde, kde
Priority: NOR    
Version First Reported In: 6.1.5   
Target Milestone: ---   
Platform: Other   
OS: Linux   
URL: https://codereview.qt-project.org/c/qt/qtdeclarative/+/576193
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description kammah 2024-09-17 19:51:03 UTC 
SUMMARY
When Plasma 6 is run in Wayland mode it is possible to induce a reproducible crash of the task switcher.

STEPS TO REPRODUCE
1. Start Plasma 6 in Wayland mode.
2. Start Konsole (it might also work with other applications, but I found it when using Konsole).
3. Press the left ALT-key and keep it pressed for at least 3 seconds.
4. Now while the ALT-key is still pressed, also press the TAB-key.

OBSERVED RESULT
When doing the steps above, I can make the task switcher crash. The crash is reproducible and only happens in Wayland mode.

EXPECTED RESULT
The task switcher should not crash.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.6.2 

ADDITIONAL INFORMATION
It is important to keep the ALT-key pressed for at least a few seconds because the crash will not happen if the ALT + TAB sequence is executed fast enough.

I suspect this is a crash of the task switcher because when doing this in X11 mode a 'task switcher' window appears briefly at the center of the screen with all opened applications in it.
In Wayland mode this window does not appear.
Comment 1 cwo 2024-09-17 20:06:19 UTC 
Thank you for the bug report!

I cannot reproduce this bug on git master (running on Tuxedo OS) - even if I hold Alt for ten seconds with Konsole focused, there is no crash when pressing tab.

 If something crashed, we need a backtrace of it so we can figure out what's going on. Can you please attach a backtrace of the crash using the coredumpctl command-line program, as detailed in https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports#Retrieving_a_backtrace_using_coredumpctl?

Some more information about your system would also be helpful; in particular: what graphics card are you using, and which task switcher do you have enabled in System Settings > Window Management > Task Switcher?
Comment 2 kammah 2024-09-18 17:50:17 UTC 
Thanks for your response.
The task switcher is the standard one for Kubuntu: KWin.
The graphical processor according to the info center is: Mesa Intel® HD Graphics 2500.

I'm not sure what information you want from the backtrace so I'm going to give you all the information I can retrieve.

1) Output of coredumpctl:

Wed 2024-09-18 19:21:23 CEST 1481 1000 1000 SIGSEGV present  /usr/bin/kwin_wayland                          15.7M

2) Output of coredumpctl gdb 1481:

           PID: 1481 (kwin_wayland)
           UID: 1000 (owner)
           GID: 1000 (owner)
        Signal: 11 (SEGV)
     Timestamp: Wed 2024-09-18 19:21:12 CEST (18min ago)
  Command Line: /usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0 --xwayland-fd 8 --xwayland-fd 9 --xwayland-display :1 --xwayland-xauthority /run/user/1000/xauth_ZfcYPX --xwayland
    Executable: /usr/bin/kwin_wayland
 Control Group: /user.slice/user-1000.slice/user@1000.service/session.slice/plasma-kwin_wayland.service
          Unit: user@1000.service
     User Unit: plasma-kwin_wayland.service
         Slice: user-1000.slice
     Owner UID: 1000 (owner)
       Boot ID: 815fa1a0930a4be69d972d4e4af7caa7
    Machine ID: 23d41669b8484e9d80336c898296543d
      Hostname: computer
       Storage: /var/lib/systemd/coredump/core.kwin_wayland.1000.815fa1a0930a4be69d972d4e4af7caa7.1481.1726680072000000.zst (present)
  Size on Disk: 15.7M
       Package: glibc/2.40-1ubuntu3
      build-id: 8e87ae6fe72fbc528c5f7e24204eeab0295309aa
       Message: Process 1481 (kwin_wayland) of user 1000 dumped core.
                
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                Module libkwin.so.6 from deb kwin-4:6.1.5-0ubuntu2.amd64
                Module libqaccessibilityclient-qt6.so.0 from deb libqaccessibilityclient-0.6.0-3.amd64
                Module libKF6ConfigWidgets.so.6 from deb kf6-kconfigwidgets-6.5.0-0ubuntu1.amd64
                Module libKF6Svg.so.6 from deb kf6-ksvg-6.5.0-0ubuntu1.amd64
                Module libsystemd.so.0 from deb systemd-256.5-2ubuntu2.amd64
                Module kwin_wayland from deb glibc-2.40-1ubuntu3.amd64
                Stack trace of thread 1481:
                #0  0x00007992288a4b3b _ZN19QSGSoftwareRenderer6renderEv (libQt6Quick.so.6 + 0x2a4b3b)
                #1  0x00007992288d2466 _ZN11QSGRenderer11renderSceneEv (libQt6Quick.so.6 + 0x2d2466)
                #2  0x0000799228881653 _ZN19QQuickWindowPrivate16renderSceneGraphEv (libQt6Quick.so.6 + 0x281653)
                #3  0x00007992288a610b n/a (libQt6Quick.so.6 + 0x2a610b)
                #4  0x00007992288a68d1 n/a (libQt6Quick.so.6 + 0x2a68d1)
                #5  0x0000799226ffc5cc _ZN7QWindow5eventEP6QEvent (libQt6Gui.so.6 + 0x1fc5cc)
                #6  0x0000799227993060 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0x193060)
                #7  0x0000799226765b98 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x165b98)
                #8  0x0000799226fb1d45 _ZN22QGuiApplicationPrivate18processExposeEventEPN29QWindowSystemInterfacePrivate11ExposeEventE (libQt6Gui.so.6 + 0x1b1d45)
                #9  0x00007992270032bc _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Gui.so.6 + 0x2032bc)
                #10 0x00007992270034b0 _ZN22QWindowSystemInterface23flushWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Gui.so.6 + 0x2034b0)
                #11 0x0000799226fe0d84 _ZN15QPlatformWindow10setVisibleEb (libQt6Gui.so.6 + 0x1e0d84)
                #12 0x00007992074525f8 _ZThn40_N11PlasmaQuick6Dialog17componentCompleteEv (libPlasmaQuick.so.6 + 0x415f8)
                #13 0x0000799228316470 _ZN17QQmlObjectCreator8finalizeER26QQmlInstantiationInterrupt (libQt6Qml.so.6 + 0x316470)
                #14 0x00007992282ed457 _ZN20QQmlIncubatorPrivate8incubateER26QQmlInstantiationInterrupt (libQt6Qml.so.6 + 0x2ed457)
                #15 0x00007992282ee037 _ZN17QQmlEnginePrivate8incubateER13QQmlIncubatorRK14QQmlRefPointerI15QQmlContextDataE (libQt6Qml.so.6 + 0x2ee037)
                #16 0x0000799225909f1c n/a (libQt6QmlModels.so.6 + 0x71f1c)
                #17 0x00007992258d1816 _ZN23QQmlInstantiatorPrivate11modelObjectEib (libQt6QmlModels.so.6 + 0x39816)
                #18 0x00007992258d1fc5 _ZN23QQmlInstantiatorPrivate10regenerateEv (libQt6QmlModels.so.6 + 0x39fc5)
                #19 0x000079922826ff43 n/a (libQt6Qml.so.6 + 0x26ff43)
                #20 0x0000799228285883 n/a (libQt6Qml.so.6 + 0x285883)
                #21 0x0000799228284192 _ZN11QQmlBinding8doUpdateERKN24QQmlJavaScriptExpression13DeleteWatcherE6QFlagsIN16QQmlPropertyData9WriteFlagEERN3QV45ScopeE (libQt6Qml.so.6 + 0x284192)
                #22 0x0000799228282036 _ZN11QQmlBinding6updateE6QFlagsIN16QQmlPropertyData9WriteFlagEE (libQt6Qml.so.6 + 0x282036)
                #23 0x000079922831008c _ZN12QQmlNotifier10emitNotifyEP20QQmlNotifierEndpointPPv (libQt6Qml.so.6 + 0x31008c)
                #24 0x00007992267b9728 n/a (libQt6Core.so.6 + 0x1b9728)
                #25 0x0000799229382250 _ZN4KWin6TabBox6TabBox4showEv (libkwin.so.6 + 0x582250)
                #26 0x00007992267b9944 n/a (libQt6Core.so.6 + 0x1b9944)
                #27 0x00007992267bd1fd _ZN6QTimer7timeoutENS_14QPrivateSignalE (libQt6Core.so.6 + 0x1bd1fd)
                #28 0x00007992267a2c19 _ZN7QObject5eventEP6QEvent (libQt6Core.so.6 + 0x1a2c19)
                #29 0x0000799227993060 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 + 0x193060)
                #30 0x0000799226765b98 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x165b98)
                #31 0x00007992268b45a6 _ZN14QTimerInfoList14activateTimersEv (libQt6Core.so.6 + 0x2b45a6)
                #32 0x00007992268aec00 _ZN20QEventDispatcherUNIX13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x2aec00)
                #33 0x000079922734d182 _ZN23QUnixEventDispatcherQPA13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Gui.so.6 + 0x54d182)
                #34 0x000079922676ff3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x16ff3b)
                #35 0x0000799226768f7c _ZN16QCoreApplication4execEv (libQt6Core.so.6 + 0x168f7c)
                #36 0x000057dea1f0a62b n/a (kwin_wayland + 0x5c62b)
                #37 0x0000799225e2a3b8 __libc_start_call_main (libc.so.6 + 0x2a3b8)
                #38 0x0000799225e2a47b __libc_start_main_impl (libc.so.6 + 0x2a47b)
                #39 0x000057dea1f10ad5 n/a (kwin_wayland + 0x62ad5)
                
                Stack trace of thread 1540:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea1496 __pthread_cond_wait_common (libc.so.6 + 0xa1496)
                #2  0x0000799229255b28 n/a (libkwin.so.6 + 0x455b28)
                #3  0x000079922924a556 n/a (libkwin.so.6 + 0x44a556)
                #4  0x0000799225ea73cb __pthread_once_slow (libc.so.6 + 0xa73cb)
                #5  0x0000799225ea7439 ___pthread_once (libc.so.6 + 0xa7439)
                #6  0x000079922925303f n/a (libkwin.so.6 + 0x45303f)
                #7  0x000079922682fbb5 n/a (libQt6Core.so.6 + 0x22fbb5)
                #8  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #9  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #10 0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1532:
                #0  0x0000799225f256a0 __GI_ppoll (libc.so.6 + 0x1256a0)
                #1  0x00007992253a9d11 n/a (libglib-2.0.so.0 + 0xbfd11)
                #2  0x00007992253486d3 g_main_context_iteration (libglib-2.0.so.0 + 0x5e6d3)
                #3  0x0000799226971f13 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x371f13)
                #4  0x000079922676ff3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x16ff3b)
                #5  0x000079922683682b _ZN7QThread4execEv (libQt6Core.so.6 + 0x23682b)
                #6  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #7  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #8  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1542:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799229255c50 n/a (libkwin.so.6 + 0x455c50)
                #3  0x000079922924a556 n/a (libkwin.so.6 + 0x44a556)
                #4  0x0000799225ea73cb __pthread_once_slow (libc.so.6 + 0xa73cb)
                #5  0x0000799225ea7439 ___pthread_once (libc.so.6 + 0xa7439)
                #6  0x000079922925303f n/a (libkwin.so.6 + 0x45303f)
                #7  0x000079922682fbb5 n/a (libQt6Core.so.6 + 0x22fbb5)
                #8  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #9  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #10 0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1543:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799229255c50 n/a (libkwin.so.6 + 0x455c50)
                #3  0x000079922924a556 n/a (libkwin.so.6 + 0x44a556)
                #4  0x0000799225ea73cb __pthread_once_slow (libc.so.6 + 0xa73cb)
                #5  0x0000799225ea7439 ___pthread_once (libc.so.6 + 0xa7439)
                #6  0x000079922925303f n/a (libkwin.so.6 + 0x45303f)
                #7  0x000079922682fbb5 n/a (libQt6Core.so.6 + 0x22fbb5)
                #8  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #9  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #10 0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1541:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799229255c50 n/a (libkwin.so.6 + 0x455c50)
                #3  0x000079922924a556 n/a (libkwin.so.6 + 0x44a556)
                #4  0x0000799225ea73cb __pthread_once_slow (libc.so.6 + 0xa73cb)
                #5  0x0000799225ea7439 ___pthread_once (libc.so.6 + 0xa7439)
                #6  0x000079922925303f n/a (libkwin.so.6 + 0x45303f)
                #7  0x000079922682fbb5 n/a (libQt6Core.so.6 + 0x22fbb5)
                #8  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #9  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #10 0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1537:
                #0  0x0000799225f256a0 __GI_ppoll (libc.so.6 + 0x1256a0)
                #1  0x00007992253a9d11 n/a (libglib-2.0.so.0 + 0xbfd11)
                #2  0x00007992253486d3 g_main_context_iteration (libglib-2.0.so.0 + 0x5e6d3)
                #3  0x0000799226971f13 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x371f13)
                #4  0x000079922676ff3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x16ff3b)
                #5  0x000079922683682b _ZN7QThread4execEv (libQt6Core.so.6 + 0x23682b)
                #6  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #7  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #8  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1509:
                #0  0x0000799225f256a0 __GI_ppoll (libc.so.6 + 0x1256a0)
                #1  0x00007992253a9d11 n/a (libglib-2.0.so.0 + 0xbfd11)
                #2  0x00007992253486d3 g_main_context_iteration (libglib-2.0.so.0 + 0x5e6d3)
                #3  0x0000799226971f13 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x371f13)
                #4  0x000079922676ff3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x16ff3b)
                #5  0x000079922683682b _ZN7QThread4execEv (libQt6Core.so.6 + 0x23682b)
                #6  0x0000799226d79ecd n/a (libQt6DBus.so.6 + 0x31ecd)
                #7  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #8  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #9  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1538:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799222140b7d n/a (libgallium-24.2.2-1ubuntu1.so + 0x140b7d)
                #3  0x000079922211d84b n/a (libgallium-24.2.2-1ubuntu1.so + 0x11d84b)
                #4  0x0000799222140aac n/a (libgallium-24.2.2-1ubuntu1.so + 0x140aac)
                #5  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #6  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1539:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799222140b7d n/a (libgallium-24.2.2-1ubuntu1.so + 0x140b7d)
                #3  0x000079922211d84b n/a (libgallium-24.2.2-1ubuntu1.so + 0x11d84b)
                #4  0x0000799222140aac n/a (libgallium-24.2.2-1ubuntu1.so + 0x140aac)
                #5  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #6  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 2238:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea100e __pthread_cond_wait_common (libc.so.6 + 0xa100e)
                #2  0x00007992268b2761 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2b2761)
                #3  0x00007992268b6416 n/a (libQt6Core.so.6 + 0x2b6416)
                #4  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #5  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #6  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 2246:
                #0  0x0000799225f256a0 __GI_ppoll (libc.so.6 + 0x1256a0)
                #1  0x00007992253a9d11 n/a (libglib-2.0.so.0 + 0xbfd11)
                #2  0x00007992253486d3 g_main_context_iteration (libglib-2.0.so.0 + 0x5e6d3)
                #3  0x0000799226971f13 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x371f13)
                #4  0x000079922676ff3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x16ff3b)
                #5  0x000079922683682b _ZN7QThread4execEv (libQt6Core.so.6 + 0x23682b)
                #6  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #7  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #8  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 1531:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea0b6d __pthread_cond_wait_common (libc.so.6 + 0xa0b6d)
                #2  0x0000799222140b7d n/a (libgallium-24.2.2-1ubuntu1.so + 0x140b7d)
                #3  0x000079922211d84b n/a (libgallium-24.2.2-1ubuntu1.so + 0x11d84b)
                #4  0x0000799222140aac n/a (libgallium-24.2.2-1ubuntu1.so + 0x140aac)
                #5  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #6  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                
                Stack trace of thread 2237:
                #0  0x0000799225e9dffd __futex_abstimed_wait_common64 (libc.so.6 + 0x9dffd)
                #1  0x0000799225ea100e __pthread_cond_wait_common (libc.so.6 + 0xa100e)
                #2  0x00007992268b2761 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x2b2761)
                #3  0x00007992268b6416 n/a (libQt6Core.so.6 + 0x2b6416)
                #4  0x00007992268b4a34 n/a (libQt6Core.so.6 + 0x2b4a34)
                #5  0x0000799225ea1e2e start_thread (libc.so.6 + 0xa1e2e)
                #6  0x0000799225f33a4c __clone3 (libc.so.6 + 0x133a4c)
                ELF object binary architecture: AMD x86-64

GNU gdb (Ubuntu 15.1-1ubuntu2) 15.1
Copyright (C) 2024 Free Software Foundation, Inc.
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
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Type "show configuration" for configuration details.
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<https://www.gnu.org/software/gdb/bugs/>.
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Reading symbols from /usr/bin/kwin_wayland...
(No debugging symbols found in /usr/bin/kwin_wayland)

warning: Can't open file /memfd:JSGCHeap:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:JSVMStack:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file anon_inode:i915.gem which was expanded to anon_inode:i915.gem during file-backed mapping note processing

warning: Can't open file /memfd:wayland-shm (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:shm (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:JITCode:QtQml (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:kwayland-shared (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:wayland-cursor (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:xwayland-shared (deleted) during file-backed mapping note processing

warning: Can't open file /memfd:unknown-usage:QtQml (deleted) during file-backed mapping note processing
[New LWP 1481]
[New LWP 1540]
[New LWP 1532]
[New LWP 1542]
[New LWP 1543]
[New LWP 1541]
[New LWP 1537]
[New LWP 1509]
[New LWP 1538]
[New LWP 1539]
[New LWP 2238]
[New LWP 2246]
[New LWP 1531]
[New LWP 2237]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0 --xwayland-fd 8 --xwayl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007992288a4b3b in QSGSoftwareRenderer::render() () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
[Current thread is 1 (Thread 0x7992160ccd40 (LWP 1481))]

3) Output of bt (at gdb prompt):

#0  0x00007992288a4b3b in QSGSoftwareRenderer::render() () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
#1  0x00007992288d2466 in QSGRenderer::renderScene() () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
#2  0x0000799228881653 in QQuickWindowPrivate::renderSceneGraph() () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
#3  0x00007992288a610b in ?? () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
#4  0x00007992288a68d1 in ?? () from /lib/x86_64-linux-gnu/libQt6Quick.so.6
#5  0x0000799226ffc5cc in QWindow::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#6  0x0000799227993060 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt6Widgets.so.6
#7  0x0000799226765b98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#8  0x0000799226fb1d45 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#9  0x00007992270032bc in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#10 0x00007992270034b0 in QWindowSystemInterface::flushWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#11 0x0000799226fe0d84 in QPlatformWindow::setVisible(bool) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#12 0x00007992074525f8 in non-virtual thunk to PlasmaQuick::Dialog::componentComplete() () from /lib/x86_64-linux-gnu/libPlasmaQuick.so.6
#13 0x0000799228316470 in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#14 0x00007992282ed457 in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#15 0x00007992282ee037 in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlRefPointer<QQmlContextData> const&) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#16 0x0000799225909f1c in ?? () from /lib/x86_64-linux-gnu/libQt6QmlModels.so.6
#17 0x00007992258d1816 in QQmlInstantiatorPrivate::modelObject(int, bool) () from /lib/x86_64-linux-gnu/libQt6QmlModels.so.6
#18 0x00007992258d1fc5 in QQmlInstantiatorPrivate::regenerate() () from /lib/x86_64-linux-gnu/libQt6QmlModels.so.6
#19 0x000079922826ff43 in ?? () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#20 0x0000799228285883 in ?? () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#21 0x0000799228284192 in QQmlBinding::doUpdate(QQmlJavaScriptExpression::DeleteWatcher const&, QFlags<QQmlPropertyData::WriteFlag>, QV4::Scope&) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#22 0x0000799228282036 in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#23 0x000079922831008c in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /lib/x86_64-linux-gnu/libQt6Qml.so.6
#24 0x00007992267b9728 in ?? () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#25 0x0000799229382250 in KWin::TabBox::TabBox::show() () from /lib/x86_64-linux-gnu/libkwin.so.6
#26 0x00007992267b9944 in ?? () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#27 0x00007992267bd1fd in QTimer::timeout(QTimer::QPrivateSignal) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#28 0x00007992267a2c19 in QObject::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#29 0x0000799227993060 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt6Widgets.so.6
#30 0x0000799226765b98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#31 0x00007992268b45a6 in QTimerInfoList::activateTimers() () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#32 0x00007992268aec00 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#33 0x000079922734d182 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt6Gui.so.6
#34 0x000079922676ff3b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#35 0x0000799226768f7c in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt6Core.so.6
#36 0x000057dea1f0a62b in ?? ()
#37 0x0000799225e2a3b8 in __libc_start_call_main (main=main@entry=0x57dea1f08700, argc=argc@entry=14, argv=argv@entry=0x7fffab1a2958) at ../sysdeps/nptl/libc_start_call_main.h:58
#38 0x0000799225e2a47b in __libc_start_main_impl (main=0x57dea1f08700, argc=14, argv=0x7fffab1a2958, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
    stack_end=0x7fffab1a2948) at ../csu/libc-start.c:360
#39 0x000057dea1f10ad5 in ?? ()
Comment 3 cwo 2024-09-18 18:36:56 UTC 
Thanks for the respose, the backtrace is already very helpful!

Regarding the task switcher, kwin is not a task switcher. What I'm talking about is the various kinds of switchers that show when you press alt-tab; the ones you can select in System Settings > Window Management > Task Switcher (there's Thumnails, Large Icons, Compact, and several more).

From what I've seeing in the backtrace, kwin is activating the alt-tab functionality and then drawing the switcher, but I can't see which one it is. This might happen with all or only some of them, so this could be relevant information.
Comment 4 kammah 2024-09-19 01:13:14 UTC 
I'm sorry about the confusion.

I looked once again in the info center and it states that the "windows manager" is KWin and it didn't occur to me before that there's a difference between windows manager and window management. But your clarification was very helpful.
According to system settings it is set to "Compact" and apparently that is not the default setting because it is highlighted as being changed, but I can't remember that I've changed it.
Comment 5 cwo 2024-09-19 06:49:18 UTC 
Great, thanks for the info! (I use Compact as well and tested it with that)

One final thing, can you test the other Task switchers to see if it happens there as well? This will help us tell whether this is specific to Compact on your system, or happens with task switchers generally.

You of course don't need to do it with all of them, two to three would be enough.
Comment 6 kammah 2024-09-20 02:18:20 UTC 
I've tested the following task switchers: miniatures, sidebar and large icons. All of these causes a crash.
I found that it isn't necessary at all to start Konsole in order to be able to invoke the crash. It 'works' even on the desktop with nothing else loaded than the system itself.
Comment 7 cwo 2024-09-20 20:52:53 UTC 
OK, thanks! I hope this helps the kwin/switcher developers figure out what's going on.
Comment 8 Vlad Zahorodnii 2024-09-23 08:10:42 UTC 
This issue was fixed upstream in Qt