Bug#1053917: libqt5gui5: Segfaults when starting QT application

[Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>]

tag 1053917 moreinfo

thanks


Hi!


On 14/10/23 05:55, Patrik Svestka wrote:
> Package: libqt5gui5
> Version: 5.15.8+dfsg-11
> Severity: important
> X-Debbugs-Cc: patrik.svestka@gmail.com
>
> Dear Maintainer,
>
>     * What led up to the situation?
>     Having CopyQ and KeePassXC QT applications autostarted
>
>     * What exactly did you do (or not do) that was effective (or
>       ineffective)?
>     No interaction needed.  Just applications fail to autostart with the libQt5XcbQpa.so.5.15.8 segfaulting.  If both the applications are started **after** Gnome starts they start normally.


Mmm, Gnome uses Wayland nowadays, and the segfault comes form libQt5XcbQpa,

which is the lib that handles X stuff. It only happens before Gnome 
completely started,

 so I wonder if we have some race condition on which Qt apps try to use 
X too soon

in the process.


But let's try this. Try starting your app on log by prepending 
QT_QPA_PLATFORM


QT_QPA_PLATFORM=wayland /usr/bin/yourapp


Or any other way that ensures that QT_QPA_PLATFORM=wayland is set as 
environment variable before starting the app.