Comment # 4 on bug 1016418 from Robin Roevens

I see the same error using virt-manager on an up-to-date LEAP 42.2: 
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Fout bij starten van domein: internal error: process exited while connecting to
monitor: spice-qemu-char: unsupported type: smartcard
allowed names: vdagent, usbredir
qemu-system-x86_64: qemu-char.c:4540: qmp_chardev_add: Assertion `!i' failed.

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 88, in
cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 124, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 83, in
newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1404, in startup
    self._backend.create()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1035, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error: process exited while connecting to monitor:
spice-qemu-char: unsupported type: smartcard
allowed names: vdagent, usbredir
qemu-system-x86_64: qemu-char.c:4540: qmp_chardev_add: Assertion `!i' failed.
----

..
If a remember correctly it did work on a fresh LEAP 42.2, but must have stopped
working somewhere after installing updates.

I also came across this similar Ubuntu bug
https://bugs.launchpad.net/ubuntu/+source/gnome-boxes/+bug/1484118 from 2015
where spice was compiled without smartcard support. I suppose this may also be
the problem here?

I could not test with the proposed qemu packages as the first link is dead and
the second does not contain qemu packages to upgrade to.