Bug 499460

Summary:	Holding backspace while using ManageEngine SNMP MIB Browser causes Plasma to completely freeze
Product:	[Plasma] plasmashell	Reporter:	Antti Savolainen <antti.savo>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	fanzhuyifan, kde
Priority:	NOR
Version First Reported In:	6.2.91
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	htop ssh screenshot

Description Antti Savolainen 2025-02-03 13:34:32 UTC

SUMMARY
Download link: https://www.manageengine.com/products/mibbrowser-free-tool/download.html
If select a text box in this program and then hold backspace, I can cause Plasma to completely freeze. If I escape to TTY with Ctrl+Alt+F3, the system is fully responsive and htop doesn't report any abnormal CPU and RAM usage.

STEPS TO REPRODUCE
1. Open ManageEngine SNMP MIB Browser
2. Select a text box.
3. Hold backspace for a few seconds

OBSERVED RESULT
Plasma freezes completely

EXPECTED RESULT
An application should not be able to freeze Plasma

SOFTWARE/OS VERSIONS
Linux: Arch Linux
KDE Plasma Version: 6.2.91
KDE Frameworks Version: 6.10.0
Qt Version: 6.9.0

Comment 1 fanzhuyifan 2025-02-03 16:20:49 UTC

Is this on x11 or wayland? When you observe the system freeze, do you see anything in the logs? Is any process using 100% CPU?

Comment 2 Antti Savolainen 2025-02-03 16:29:55 UTC

Created attachment 177931 [details]
htop ssh screenshot

I'm using wayland. Here's a htop screenshot on my phone with an ssh when the freeze happens

Comment 3 Antti Savolainen 2025-03-23 23:07:25 UTC

This might be a pipewire/wireplumber bug. See wireplumber at the top of htop

I'll report this to them tomorrow.

Comment 4 Antti Savolainen 2025-04-26 15:35:03 UTC

This was probably fixed in Pipewire upstream