Bug 470620

Summary:	Clipboard filled with image URIs can cause severe performance problems
Product:	[Plasma] plasmashell	Reporter:	annasonohana
Component:	Clipboard widget & pop-up	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate, qydwhotmail, voidpointertonull+bugskdeorg
Priority:	NOR
Version First Reported In:	master
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description annasonohana 2023-06-04 02:22:11 UTC

SUMMARY
The clipboard can cause plasmashell to use a lot of disk transfers and memory if it is filled with lots of image URIs
This persists across system restarts, until the relevant images are removed. May be related to the previews.


STEPS TO REPRODUCE
1. select around 50k images in dolphin
2. press ctrl+C
3. wait a few minutes. I/O usage and memory will increase over time.

OBSERVED RESULT
8GiB of memory, some more in swap, 100% disk read, plasmashell freezing, other programs encountering long disk waits

EXPECTED RESULT
Some sort of cap prevents the system from becoming unusable

SOFTWARE/OS VERSIONS
Linux kernel: 6.1.31-1-MANJARO (64 bit)
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Graphics platform: X11

Comment 1 Nate Graham 2023-06-05 16:17:41 UTC

Probably related to the previews, yeah. Can reproduce.

Comment 2 Pedro V 2023-08-12 13:25:50 UTC

Can't reproduce on:
Operating System: Kubuntu 23.04
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.0-27-generic (64-bit)
Graphics Platform: Wayland

I usually use Krusader, so started there, but after not seeing anything interesting started to suspect that Dolphin showing thumbnails by default may be related.
Moved to Dolphin, initial preview generation showed I/O activity, but Ctrl+A then Ctrl+C didn't really do anything interesting, even though wl-paste confirms that I have a quite long list of URIs. After a short while I started scrolling around, but progressive preview popping up and I/O activity spiking confirmed that previews were only generated on demand for scrolling.

Maybe it's different on X11?

Comment 3 Fushan Wen 2025-04-18 13:27:51 UTC

Fixed in 6.3 since the preview becomes asynchronous.