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Description of problem:

zVM guests are headless. To be able to log in graphically, I followed instructions in https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/system_administrators_guide/#vnc-based-on-xinetd (13.1.4. VNC setup based on xinetd with XDMCP for GDM).

Upon connecting to the system using vncviewer on the dedicated port 5950, it is not possible to enter the password (the prompt never shows up). Similarly, when a test user has no password set, clicking on the user item from the proposed list ends up not having anything.

In the journal we can see the following:

gnome-shell[2395]: g_task_return_error: assertion 'error != NULL' failed



Version-Release number of selected component (if applicable):

gdm-3.28.2-11.el7.s390x


How reproducible:

Always

fix is here:

https://gitlab.gnome.org/GNOME/gdm/commit/f57e11bf9a68564eedba4f0d75c122862a1ea771

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2044