Comment 13 for bug 1950193

I tested this in a VM with a freshly installed Ubuntu 20.04 Desktop. Following the steps in the description with released version 5.12.8+dfsg-0ubuntu1 freezes the entire VM.

After upgrading all the Qt packages to 5.12.8+dfsg-0ubuntu2 from proposed repo, the test program finishes immediately as expected. To upgrade, I used the following command line:

sudo aptitude install -V qtbase5-dev/focal-proposed libqt5concurrent5/focal-proposed libqt5core5a/focal-proposed libqt5dbus5/focal-proposed libqt5gui5/focal-proposed qt5-qmake/focal-proposed qtbase5-dev-tools/focal-proposed qt5-qmake-bin/focal-proposed libqt5network5/focal-proposed libqt5printsupport5/focal-proposed libqt5sql5/focal-proposed libqt5test5/focal-proposed libqt5widgets5/focal-proposed libqt5xml5/focal-proposed