https://bugs.kde.org/show_bug.cgi?id=500161
Bug ID: 500161
Summary: KWin Debug Console crashes desktop with certain
scaling percentages
Classification: Plasma
Product: kwin
Version: 6.3.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Keywords: drkonqi
Severity: crash
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: madness...@proton.me
Target Milestone: ---
Application: kwin_wayland (6.3.0)
ApplicationNotResponding [ANR]: false
Qt Version: 6.8.2
Frameworks Version: 6.10.0
Operating System: Linux 6.13.2-arch1-1 x86_64
Windowing System: Wayland
Distribution: Arch Linux
DrKonqi: 6.3.0 [CoredumpBackend]
-- Information about the crash:
When opening "Kwin Debug Console", through krunner or the start menu, it will
crash my entire desktop. This happens with certain per monitor scaling
combinations. It also matters on which screen I start KWin Debug Console from.
It crashes the desktop when started on my primary monitor, but not when started
on my secondary monitor.
I am also unable to move the KWin Debug Console between the two monitors once I
start adjusting the scaling percentages.
In the following scenario I can reliably reproduce a crash:
Monitor 1: 2560x1440 (125% scaling, primary)
Monitor 2: 3840x2160 (175% scaling, 90 degrees clockwise, left of monitor 1)
However, when I set the scaling of monitor 2 to 185%, it doesn't crash anymore.
Tested and reproducable with a fresh install of Arch Linux, and also on freshly
updated Fedora 41 install.
GPU: AMD Radeon RX 7900 XTX
Mesa: 24.3.4-1
The crash can be reproduced every time.
-- Backtrace (Reduced):
#6 0x0000724d7f0e0f01 in KWin::SurfacePixmap::setBuffer (this=0x5912309ec1a0,
buffer=0x5912309e89d0) at
/usr/src/debug/kwin/kwin-6.3.0/src/scene/surfaceitem.cpp:319
#7 KWin::SurfacePixmap::setBuffer (this=this@entry=0x5912309ec1a0,
buffer=0x5912309e89d0) at
/usr/src/debug/kwin/kwin-6.3.0/src/scene/surfaceitem.cpp:312
#8 0x0000724d7f0e1590 in KWin::SurfacePixmapInternal::update
(this=0x5912309ec1a0) at
/usr/src/debug/kwin/kwin-6.3.0/src/scene/surfaceitem_internal.cpp:63
#9 0x0000724d7f0df033 in KWin::SurfaceItem::updatePixmap
(this=this@entry=0x59123163e870) at
/usr/src/debug/kwin/kwin-6.3.0/src/scene/surfaceitem.cpp:190
#10 0x0000724d7f0df117 in KWin::SurfaceItem::preprocess (this=0x59123163e870)
at /usr/src/debug/kwin/kwin-6.3.0/src/scene/surfaceitem.cpp:218
Reported using DrKonqi
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