https://bugs.kde.org/show_bug.cgi?id=512434
Bug ID: 512434
Summary: System freezes for a few seconds when interacting with
x11 app using xwayland inside a docker container
Classification: Plasma
Product: kwin
Version First 6.5.3
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: xwayland
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
System freezes for a few seconds when interacting with Burpsuite’s menu bar
inside a Docker container using XWayland.
STEPS TO REPRODUCE
1. Build the docker image with the following Dockerfile
```
FROM artixlinux/artixlinux:base-openrc
WORKDIR /workspace
RUN pacman -Syu --noconfirm
RUN pacman -S --noconfirm jdk21-openjdk wget libxrandr libxtst fontconfig
ttf-firacode-nerd
RUN wget
"https://portswigger.net/burp/releases/download?product=community&version=2025.9.5&type=Jar";
-O BurpSuiteCommunity.jar
ENTRYPOINT ["/bin/bash"]
```
Build command:
`sudo docker buildx build -t xwayland-test -f Dockerfile .`
2. Create a container using that image
Allow X access for GUI:
`xhost +local:`
Run the container:
`sudo docker run -ti -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -e
XDG_RUNTIME_DIR=/tmp -e WAYLAND_DISPLAY=$WAYLAND_DISPLAY -v
$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY:/tmp/$WAYLAND_DISPLAY --name xwayland
xwayland-test`
3. Start burpsuite in the container:
`_JAVA_OPTIONS='-Dawt.useSystemAAFontSettings=on -Dswing.aatext=true' java -jar
BurpSuiteCommunity.jar`
OBSERVED RESULT
When hovering over or clicking the items in Burp’s main menu bar (Burp /
Project / Intruder etc), or when a new window/dialog spawns, the entire system
freezes for a few seconds.
Quitting the application also triggers the freeze.
EXPECTED RESULT
X11 applications running inside a Docker container via XWayland should not
freeze the system.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.0
Kernel Version: 6.17.8-2-cachyos (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
`journalctl -f` logs during freeze events.
Nov 21 17:26:27 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:26:29 cachyos systemd[1420]:
[email protected]: Consumed 2.470s
CPU time, 182.1M memory peak.
Nov 21 17:26:31 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:16 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:20 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:25 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:28 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:32 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Nov 21 17:30:35 cachyos kwin_wayland[27697]: 0x1: GL_INVALID_VALUE in
glTexSubImage2D(xoffset 0 + width 48 > 10)
Nov 21 17:30:39 cachyos kwin_wayland[27697]: The main thread was hanging
temporarily!
Video showing the freezes:
https://youtu.be/9wH5EgBtB0M
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