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

Running "gdm" on s390x in a KVM guest with virtio-gpu does not work anymore.

Please provide the package NVR for which bug is seen:

The issue started in compose RHEL-9.5.0-20240621.6 with:

kernel-5.14.0-467.el9.s390x
gnome-session-40.1.1-9.el9.s390x
gnome-shell-40.10-20.el9.s390x
mesa-libGL-24.1.0-2.el9.s390x
mutter-40.9-16.el9.s390x

Everything was still working fine in the previous compose RHEL-9.5.0-20240616.55 with:

kernel-5.14.0-460.el9.s390x
gnome-session-40.1.1-9.el9.s390x
gnome-shell-40.10-20.el9.s390x
mesa-libGL-23.3.3-1.el9.s390x
mutter-40.9-16.el9.s390x

How reproducible:

100%

Steps to reproduce

1. virt-install  --name r9 --ram=4096 --vcpus=1 --nographcis --accelerate   --network network=default,model=virtio   -l http://.../RHEL-9.5.0-20240621.6/compose/BaseOS/s390x/os/ --debug  -console pty,target_type=sclp   --disk /var/lib/libvirt/images/rhel9.qcow2,size=12
2. Once the guest has finished installation, shut it down and run "virsh edit r9" to add these XML snippets:
       <input type='keyboard' bus='virtio'>
       </input>
       <input type='mouse' bus='virtio'>
       </input>
       <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
         <listen type='address' address='127.0.0.1'/>
       </graphics>
       <video>
         <model type='virtio' heads='1' primary='yes'/>
       </video>
3. Start the guest again with "virsh start --console r9"
4. In the guest:
   dnf install gdm
5. In the host, use "vncviewer :0" to see the graphical output of the guest
6. In the guest:
   systemctl start gdm

Expected results

The GDM login screen should show up in the VNC window

Actual results

In the VNC window there is only the message: "Oh no! Something has gone wrong. A problem has occurred and the system can't recover. Please contact a system administrator".

In the output of "dmesg" there is a message like:

 User process fault: interruption code 003b ilc:3 in libc.so.6[3ff8fd00000+1c9000]
 Failing address: 0000000000000000 TEID: 0000000000000800
 Fault in primary space mode while using user ASCE.
 AS:00000000cace01c7 R3:0000000000000024 
 CPU: 0 PID: 27746 Comm: gnome-session-c Kdump: loaded Not tainted 5.14.0-467.el9.s390x #1
 Hardware name: IBM 3931 LA1 400 (KVM/Linux)
 User PSW : 0705000180000000 000003ff8fdf2ec6
            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
 User GPRS: 0000000000000000 0000000000000000 000000000000000f 0000000000000000
            0000000000000000 0000000000000000 0000000000000000 0000000000000000
            0000000000000000 000003ffceb79b98 0000000000000000 0000000000000000
            000003ff905aef68 0000000000000000 000003ffceb79a80 000003ffceb799c0
 User Code: 000003ff8fdf2eb8: a71b0010        aghi    %r1,16
            000003ff8fdf2ebc: e70000300081    vfene    %v0,%v0,%v0,0,3
           #000003ff8fdf2ec2: a784000c        brc    8,000003ff8fdf2eda
           >000003ff8fdf2ec6: e70180004006    vl    %v0,0(%r1,%r8),4
            000003ff8fdf2ecc: a71b0010        aghi    %r1,16
            000003ff8fdf2ed0: e70000300081    vfene    %v0,%v0,%v0,0,3
            000003ff8fdf2ed6: a774fff8        brc    7,000003ff8fdf2ec6
            000003ff8fdf2eda: e73000070021    vlgv    %r3,%v0,7,0
 Last Breaking-Event-Address:
  [<000003ff8fdf2f32>] 0x3ff8fdf2f32