https://bugs.kde.org/show_bug.cgi?id=504983
Bug ID: 504983
Summary: KWin Scripting API - Crash when Assigning
Window::desktops to Array of Strings instead of Array
of KWin::VirtualDesktop*
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: openSUSE
OS: Linux
Status: REPORTED
Keywords: drkonqi
Severity: crash
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Application: kwin_wayland (6.3.5)
ApplicationNotResponding [ANR]: false
Qt Version: 6.9.0
Frameworks Version: 6.13.0
Operating System: Linux 6.14.6-1.0.4.sr20250501-default x86_64
Windowing System: Wayland
Distribution: "openSUSE Tumbleweed-Slowroll"
DrKonqi: 6.3.5 [CoredumpBackend]
-- Information about the crash:
I have been working on a KWin script to combine the functionality of "Show in
Activities" and "Show on Desktops" from the window actions menu into one menu,
so that I can file a window away exactly where I want it in one click (plan to
upload it, if anyone happens ot be interested).
Whilst developing this, I accidentally assigned to the list of desktops on
which a window is active from an array of strings (with the desktop name), as
we do for activities, instead of an array of pointers to the exposed
KWin::VirtualDesktop instances.
MRE:
``Javascript
var activityUUID = /* ... */ "2a96ec5f-5da8-4cc8-b92f-eeebc91287a5";
var desktop = workspace.desktops[0];
var desktopName = desktop.name;
workspace.activeWindow.activities = [activityUUID]
//workspace.activeWindow.desktops = [desktopName ] // Whoops
workspace.activeWindow.desktops = [desktop ] // This is what we meant.
```
This causes a crash in KWin (not a terrible one, as all my applications survive
it), rather than the expected behaviour of some kind of typecast error being
logged to journalctl and having the compositor conitnue on its merry way.
I haven't looked at the source yet, but scanning the backtrace, it seems it
gets reasonably far down with a null KWin::VirtualDesktop*, which to me would
suggest a cast has failed but the result has not been checked somewhere before
continuing.
I can also reproduce it putting anything inside the array, i.e.
``Javascript
workspace.activeWindow.desktops = [8008135]
```
The crash can be reproduced every time.
-- Backtrace (Reduced):
#5 QArrayDataPointer<char16_t>::QArrayDataPointer (this=<optimized out>,
other=...) at /usr/include/qt6/QtCore/qarraydatapointer.h:37
#6 QString::QString (this=<optimized out>, other=..., this=<optimized out>,
other=<optimized out>) at /usr/include/qt6/QtCore/qstring.h:1339
#7 KWin::VirtualDesktop::id (this=0x0, this=<optimized out>) at
/usr/src/debug/kwin-6.3.5/src/virtualdesktops.h:47
#8 KWin::Window::setDesktops (this=0x563ca0056190, desktops=...) at
/usr/src/debug/kwin-6.3.5/src/window.cpp:734
#9 0x00007f7172a63ec8 in KWin::Window::qt_static_metacall (_o=<optimized out>,
_c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at
/usr/src/debug/kwin-6.3.5/build/src/kwin_autogen/include/moc_window.cpp:931
Reported using DrKonqi
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