A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/3017

It's possible that a destroyed window gets stuck in workspace's window list, which should be fixed in final 5.26 tars, but not 5.25.90. Can you check whether the issue is still reproducible in final 5.26? The linked MR may potentially fix the crash too.

Git commit d2899928cdb8eb5b197ea592113a8dbc9de5160a by Vlad Zahorodnii.
Committed on 05/10/2022 at 06:38.
Pushed by vladz into branch 'master'.

Reset m_delayFocusWindow in Workspace::cancelDelayFocus()

M  +1    -0    src/workspace.cpp

https://invent.kde.org/plasma/kwin/commit/d2899928cdb8eb5b197ea592113a8dbc9de5160a

Git commit d449ab5e39b395b9667c9559ec9f95cb071c6f0a by Vlad Zahorodnii.
Committed on 05/10/2022 at 07:03.
Pushed by vladz into branch 'Plasma/5.26'.

Reset m_delayFocusWindow in Workspace::cancelDelayFocus()


(cherry picked from commit d2899928cdb8eb5b197ea592113a8dbc9de5160a)

M  +1    -0    src/workspace.cpp

https://invent.kde.org/plasma/kwin/commit/d449ab5e39b395b9667c9559ec9f95cb071c6f0a

*** Bug 460081 has been marked as a duplicate of this bug. ***

*** Bug 460081 has been marked as a duplicate of this bug. ***

*** Bug 460574 has been marked as a duplicate of this bug. ***

https://bugs.kde.org/show_bug.cgi?id=460574 suggests it's not fixed in 5.26.0

Pasting backtrace from attachment inline for searchability:

```
#0  0x00007f21cd3a46ea in KWin::Workspace::takeActivity(KWin::Window*, QFlags<KWin::Workspace::ActivityFlag>) (this=0x5649debc6a10, window=0x5649dfdb3250, flags=...) at /usr/src/debug/kwin-5.25.90/src/activation.cpp:361
#1  0x00007f21cd4e2d77 in KWin::Workspace::delayFocus() (this=0x5649debc6a10) at /usr/src/debug/kwin-5.25.90/src/workspace.cpp:1572
#2  0x00007f21cbabd381 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffeae4bb590, r=<optimized out>, this=0x5649dfcb6760, this=<optimized out>, r=<optimized out>, a=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#3  doActivate<false>(QObject*, int, void**) (sender=0x7f217000b080, signal_index=3, argv=0x7ffeae4bb590) at kernel/qobject.cpp:3919
#4  0x00007f21cbabf8df in QTimer::timeout(QTimer::QPrivateSignal) (this=<optimized out>, _t1=...) at .moc/moc_qtimer.cpp:205
#5  0x00007f21cbab04c6 in QObject::event(QEvent*) (this=0x7f217000b080, e=0x7ffeae4bb700) at kernel/qobject.cpp:1324
#6  0x00007f21cb178b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x7f217000b080, e=0x7ffeae4bb700) at kernel/qapplication.cpp:3637
#7  0x00007f21cba8cb88 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x7f217000b080, event=0x7ffeae4bb700) at kernel/qcoreapplication.cpp:1064
#8  0x00007f21cbad6d53 in QTimerInfoList::activateTimers() (this=0x5649de833ac8) at kernel/qtimerinfo_unix.cpp:643
#9  0x00007f21cbad7202 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:516
#10 0x00005649de1ad3d2 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
#11 0x00007f21cba8532c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffeae4bb8a0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#12 0x00007f21cba8fe59 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#13 0x00007f21cbf3a0e2 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1870
#14 0x00007f21cb176f2a in QApplication::exec() () at kernel/qapplication.cpp:2829
#15 0x00005649de0ce5bc in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin-5.25.90/src/main_wayland.cpp:620
````

*** Bug 467836 has been marked as a duplicate of this bug. ***

Can you reproduce the crash in Plasma 6.0?

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Created attachment 174940 [details]
attachment-1060574-0.html

For the one marked as "duplicate" (still doesn't seem related to me, I couldn't reproduce OPs bug anyway), I can't reproduce it anymore :)

11 Ekim 2024 05:49:14 GMT+02:00, Bug Janitor Service <bugzilla_noreply@kde.org> yazdı:
>https://bugs.kde.org/show_bug.cgi?id=459860
>
>--- Comment #12 from Bug Janitor Service <bug-janitor@kde.org> ---
>🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days.
>Please provide the requested information, then set the bug status to REPORTED.
>If there is no change for at least 30 days, it will be automatically closed as
>RESOLVED WORKSFORME.
>
>For more information about our bug triaging procedures, please read
>https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.
>
>Thank you for helping us make KDE software even better for everyone!
>
>-- 
>You are receiving this mail because:
>You are on the CC list for the bug.

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.