Bug 504642

Summary:	Plasmashell crash/hang when moving widgets to another panel that only has Icons-only task manager.
Product:	[Plasma] plasmashell	Reporter:	Luis <stereomato>
Component:	Panel	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	crash	CC:	nate, niccolo.venerandi
Priority:	NOR
Version First Reported In:	6.3.5
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	6.4.0
Sentry Crash Report:

Description Luis 2025-05-22 00:01:21 UTC

SUMMARY
I can consistently crash/hang the plasmashell process (desktop, panels don't react to anything or just disappear and reappear) by doing what I described in the title.

STEPS TO REPRODUCE
What I did was:
1. Enter edit mode
2. Click on top panel (which was the default bottom one) to move the Pager widget to the panel on the left side (Which only has the Icon-only task manager)
3. Click on the pager widget and drag directly to the top of the left side panel
4. Hang/crash

OBSERVED RESULT
Hang/crash

EXPECTED RESULT
The widget is moved to the left side panel, and there is no hang or crash

SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.6-zen1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × 12th Gen Intel® Core™ i5-12500H
Memory: 23.2 GiB of RAM
Graphics Processor: Intel® Iris® Xe Graphics

ADDITIONAL INFORMATION
This is easy to work around, just add the widget from the bottom of the left side panel.
Sliding the widget around in the left side panel is fine, but dragging it out from that panel and trying to insert it from the top triggers the crash again.

Comment 1 Nate Graham 2025-05-22 15:00:58 UTC

This is working quite consistently for me on git master, which means it's very likely fixed in the upcoming Plasma 6.4 release.

However if after upgrading to that release, you find you can still reproduce the issue, feel free to re-open this bug report.

Thanks a lot!