Gerd, with current master build via a slightly fixed up fedora spec file I do get a crash in virtio-gpu when libvirt queries the qemu. I can trigger that also via command line
$ /usr/bin/qemu-system-s390x -device virtio-gpu-pci,help qemu-system-s390x: -device virtio-gpu-pci,help: missing object type 'virtio-gpu-device' Aborted (core dumped) $ /usr/bin/qemu-system-s390x -device virtio-gpu-ccw,help qemu-system-s390x: -device virtio-gpu-ccw,help: missing object type 'virtio-gpu-device' Aborted (core dumped) Since I cannot reproduce the same when I build it without the spec file this must be something configuration specific. The call trace is: (gdb) bt #0 0x000003ff9e349026 in raise () at /lib64/libc.so.6 #1 0x000003ff9e32b162 in abort () at /lib64/libc.so.6 #2 0x000002aa274abfca in object_initialize (data=<optimized out>, size=<optimized out>, typename=0x2aa2754904e "virtio-gpu-device") at ../qom/object.c:531 #3 object_initialize (data=<optimized out>, size=<optimized out>, typename=0x2aa2754904e "virtio-gpu-device") at ../qom/object.c:519 #4 0x000002aa274ad72a in object_initialize_child_with_propsv (parentobj=parentobj@entry=0x2aa2801bc00, propname=propname@entry=0x2aa275d99e8 "virtio-backend", childobj=childobj@entry=0x2aa2801cd88, size=<optimized out>, type=type@entry=0x2aa2754904e "virtio-gpu-device", errp=0x2aa277f8e88 <error_abort>, vargs=0x3fff607daa0) at ../qom/object.c:564 #5 0x000002aa274ad81c in object_initialize_child_with_props (parentobj=parentobj@entry=0x2aa2801bc00, propname=propname@entry=0x2aa275d99e8 "virtio-backend", childobj=childobj@entry=0x2aa2801cd88, size=<optimized out>, type=type@entry=0x2aa2754904e "virtio-gpu-device", errp=0x2aa277f8e88 <error_abort>) at ../qom/object.c:547 #6 0x000002aa273718d2 in virtio_instance_init_common (proxy_obj=0x2aa2801bc00, data=0x2aa2801cd88, vdev_size=<optimized out>, vdev_name=0x2aa2754904e "virtio-gpu-device") at ../hw/virtio/virtio.c:3234 #7 0x000002aa274abea2 in object_initialize_with_type (obj=0x2aa2801bc00, size=<optimized out>, type=0x2aa27ff7240) at ../qom/object.c:515 #8 0x000002aa274ac034 in object_new_with_type (type=0x2aa27ff7240) at ../qom/object.c:729 #9 0x000002aa274b8ec0 in qmp_device_list_properties (typename=typename@entry=0x2aa280184b0 "virtio-gpu-ccw", errp=errp@entry=0x3fff607de78) at ../qom/qom-qmp-cmds.c:153 #10 0x000002aa27293362 in qdev_device_help (opts=0x2aa280184d0) at ../qdev-monitor.c:283 #11 0x000002aa2752b31e in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x2aa2731f700 <device_help_func>, opaque=opaque@entry=0x0, errp=errp@entry=0x0) at ../util/qemu-option.c:1172 #12 0x000002aa27321f5c in qemu_init (argc=<optimized out>, argv=0x3fff607e418, envp=<optimized out>) at ../softmmu/vl.c:3825 #13 0x000002aa271ed042 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../softmmu/main.c:49 any quick idea?