Qt app UI elements randomly rendered as blank/black in Docker

[Geeva]

I prepared Dockerfile to build Docker image of my Qt application. To run the application I use X - I enable access to X server (xhost +local:root) , then I use the following command to run it:

docker run -it --env="DISPLAY" --env="QT_X11_NO_MITSHM=1" \
    --volume="/tmp/.X11-unix:/tmp/.X11-unix:rw" mindforger:latest mindforger

The problem is that some Qt UI elements (menu items, dialogs, ...) are rendered blank in black (randomly) - check the screenshot below:

I'm on Ubuntu 16.04.5 with Docker 18.06 and Qt 5.01.

[sierdzio]

But... why? Why docker?

Anyway. Do other applications show normally? Like some standard Gnome/KDE apps.

I strongly recommend using something newer than Qt 5.0.1. It was an extremely buggy release. And it's super old.

[lduboeuf]

I have the same with Ubuntu 16.04 on Docker and Qt Creator 4.5.2

[mrjj]

@lduboeuf
Hi
Nothing we can do about it. Its a docker issue.

Make sure you run a full Linux with X server etc inside the docker.
Then i had no issues running my app.

If you use a special docker, it might have side effects as not operating like a normal OS would.

[Kshepitzki]

Geeva, was this ever solved?
I get the same problem with Qt 5.9.5, Ubuntu 18.04.6, GCC 7.5.0, Docker 20.10.14

[ZhiCoeus]

@mrjj Do you mean to install X server in the image?

[ZhiCoeus]

@Kshepitzki I try to add --ipc host to the run command，and fix this issus; Here is the distilled run command that I used;

docker run --ipc host -e DISPLAY -e XAUTHORITY -h "$HOSTNAME" -u "$(id -u):$(id -g)" --device /dev/dri/card0 -v /dev/dri/card0:/dev/dri/card0 -v /tmp/.X11-unix:/tmp/.X11-unix -v "$XAUTHORITY:$XAUTHORITY" my-qt-app

[jack_gs]

@ZhiCoeus it works！！！i test on ubuntu 16.04 and 20.04 , thanks！！！！