https://bugs.kde.org/show_bug.cgi?id=505536
Bug ID: 505536
Summary: Switching activities too quickly crashes kwin
Classification: Plasma
Product: kwin
Version First 6.3.90
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: activities
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
When there are many windows visible on the screen (maybe it's to do with the
number of windows or the time it takes to render the new activity?), switching
activities too quickly can cause kwin to crash. This is most observable when
using activity-aware firefox, as this crash crashes all of the Firefox
instances as well. Another side-effect is that all windows are placed on the
default activity after the crash
STEPS TO REPRODUCE
1. Set up a desktop with two activities
2. On one, open many windows with at least one non-KDE app (e.g. Signal Desktop
or Firefox)
3. On another, open many windows with at least one non-KDE app (e.g.
LibreOffice)
NOTE: Whether the same app has windows on both activities does not appear
to be relevant, but it's much harder to reproduce with only KDE apps open.
4. Spam Meta+A to quickly swap between activities
OBSERVED RESULT
After several switches back and forth, kwin crashes and restarts.
EXPECTED RESULT
kwin does not crash
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.3.91
KDE Frameworks Version: 6.14.0
Qt Version: 6.8.3
Kernel Version: 6.14.0-15-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon 780M Graphics
Memory: 64 GiB of RAM (60.6 GiB usable)
Graphics Processor: AMD Radeon 780M
ADDITIONAL INFORMATION
This seems to have been introduced between 6.3.5 and 6.3.90, but it still
occurs on 6.3.91. I will try to get a backtrace this weekend.
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