What were you trying to do that didn't work?

Install RHEL into a KVM VM with virtio-gpu device.

Please provide the package NVR for which bug is seen:

anaconda-34.25.5.5-1.el9.s390x.rpm

RHEL-9.5.0-20240623.4

How reproducible:

100%

Steps to reproduce

1. # virt-install --location <compose_url> --disk size=10 --os-variant rhel9-unknown --name latest_rhel9 --memory 2048 --vcpus 2  --graphics vnc,listen=0.0.0.0 --input keyboard,bus=virtio --input tablet,bus=virtio --name rhel9

2. identify the port to connect vnc to (virsh dumpxml rhel9|grep listen); open the port if necessary, e.g. firewall-cmd --add-port 5900/tcp
3. connect to the graphical session, e.g. w/ tigervnc or virtviewer

Expected results

The graphical installer shows, I can advance and finish a graphical installation.

Actual results

A box with an error message is shown.

Hitting the Debug button doesn't switch to tty1.

When I connect to the console (virsh console rhel9) then I land in a pdb session.

Additional info

1. When I install graphically with compose RHEL-9.5.0-20240611.36 and then upgrade the guest kernel to the one in RHEL-9.5.0-20240623.4, gnome still works, that's why I assume it's an issue with anaconda. I'll add the error message as soon as I can get it out of the system (remote session doesn't support c&p)
2. The host kernel is 5.14.0-460, in case this could make a difference, I'll also try to start the guest with gnome and latest kernel on a more recent kernel.
3. It reproduces on LPAR ('baremetal') installation.

     File "/usr/lib64/python3.9/site-packages/gi/_ossighelper.py", line 92, in signal_notify
       def signal_notify(source, condition):
   pyanaconda.errors.ExitError: gnome-kiosk exited on signal 11

4. I asked others for help to try reproduce this on other archs.