Bug 511483 - QtWebEngineProcess leaks memory
Summary: QtWebEngineProcess leaks memory
Status: REOPENED
Alias: None
Product: plasmashell
Classification: Plasma
Component: generic-performance (other bugs)
Version First Reported In: 6.5.1
Platform: Arch Linux Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-11-01 20:20 UTC by Oleg
Modified: 2025-12-05 21:41 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:


Attachments
QtWebEngineProcess leaks memory (327.50 KB, image/avif)
2025-11-01 20:20 UTC, Oleg
Details
almost 4 GiB of QtWebEngine (347.25 KB, image/avif)
2025-11-02 19:11 UTC, Oleg
Details

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Description Oleg 2025-11-01 20:20:37 UTC
Created attachment 186400 [details]
QtWebEngineProcess leaks memory

SUMMARY
QtWebEngineProcess leaks memory over time

STEPS TO REPRODUCE
1. Run Plasma Wayland Session

OBSERVED RESULT
Over time QtWebEngineProcess will leak memory

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.6-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 64 ГиБ of RAM (62.4 ГиБ usable)
Graphics Processor: AMD Radeon RX 6700 XT
Manufacturer: ASUS

ADDITIONAL INFORMATION
This is regression in Plasma 6.5.0
I have ChatAI plasmoid installed, yet it wasn't causing memory leaks untill Plasma 6.5.0 and it wasn't updated since May https://github.com/DenysMb/ChatAI-Plasmoid
Comment 1 Oleg 2025-11-02 19:11:29 UTC
Created attachment 186424 [details]
almost 4 GiB of QtWebEngine

I've captured it consuming almost 5 GiB of memory
Comment 2 hamelg 2025-11-08 20:18:59 UTC
I'm also experiencing this issue with the web browser widget.
Open the widget and go to the following URL:

https://widgets.meteox.com/en-GB/widgets/radar/location/2973400/rain?z=8

Then close the widget window.
After a few hours, the QtWebEngineProcess process is consuming over 2 GB of memory, and this consumption continues to increase.
Comment 3 Oleg 2025-12-04 20:13:55 UTC
After updating to Qt 6.10.1 I can no longer reproduce the issue. I guess it was a regression in Qt that has nothing to do with Plasma.
Comment 4 hamelg 2025-12-05 21:41:19 UTC
I updated to qt6.10.1 and I'm still experiencing the problem.