https://bugs.kde.org/show_bug.cgi?id=510290
Bug ID: 510290
Summary: when using Podman with X11 forwarding, quickly moving
the mouse horizontally across the top menu bar in any
QT application to rapidly switch between different
dropdown menus triggers UI freezing.
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
when using Podman with X11 forwarding, quickly moving the mouse horizontally
across the top menu bar in any QT application to rapidly switch between
different dropdown menus triggers UI freezing.
STEPS TO REPRODUCE
1.
Create a container image with any QT application:
```dockerfile
FROM docker.io/debian:latest
RUN apt-get update && \
apt-get install -y wireshark && \
apt-get autoclean
```
2.
Run the QT application with X11 forwarding
```sh
podman build -t test .
podman run -it --rm \
-v /tmp/.X11-unix/X1:/tmp/.X11-unix/X1:rw \
-v $XAUTHORITY:/root/.Xauthority \
-e DISPLAY=$DISPLAY \
localhost/test wireshark
```
3.
Quickly swiping the mouse horizontally back and forth across the top menu bar
to rapidly switch between different dropdown menus
OBSERVED RESULT
UI freezes for several seconds before recovering responsiveness.
journalctl -f
arch kwin_wayland[1367]: kwin_wayland_drm: The main thread was hanging
temporarily!
EXPECTED RESULT
no UI freezing
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux x86_64
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 5.15.17
ADDITIONAL INFORMATION
Successfully reproduced on both AMD RX6500 and Intel Iris Xe
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