QMainWindows and SystemTrayIcon stops responding and see QXcbConnection: XCB Error

[anshah]

My GUI project consists of a QMainWIndow and a QSystemTrayIcon.

When resizing a Citrix VDI screen the QMainWindow and QSystemTrayIcon stop responding and the following is seen in the logs:

QXcbConnection: XCB error: 148 (Unknown), sequence: 842, resource id: 0, major code: 140 (Unknown), minor code: 20

A core dump was produced and after the QXcbConnection is seen in the logs and the UI stops responding thereafter.

After looking through Qt code I saw that this is printed in:

QXcbConnection::handleXcbEvents

If you guys have any idea where I could start investigating or more info on which of the GUI components cause the XCB error that would be helpful.

[SGaist]

Hi,

Can you give more details about your setup ?
Which version of Qt are you using ?
On which OS/Distribution ?

[anshah]

This is for a customer running running Qt 5.9 on RedHat 7.8 using GNome desktop.
The screen is a Citrix VDI screen. When resizing the screen the QSystemTrayIcon becomes unresponsive.

[SGaist]

@anshah said in QMainWindows and SystemTrayIcon stops responding and see QXcbConnection: XCB Error:

Citrix VDI

Just to be sure I understand, he uses a remote session ?

[anshah]

Yes Citrix VDI is similar VNC Viewer I believe where it is a remote session screen.

[anshah]

@SGaist

I have some update on this. The application is running but the QSystemTrayIcon becomes unresponsive to mouse clicks. Is there a way to reload the QSystemTrayIcon so it is responsive?

[SGaist]

You can delete the old icon and instanciate a new one to see if things go better.