what is the guest that hangs in this so one could try reproduce?
Virtual HW changes slightly with versions and implementations.
The implementation can't be swicthed (I've seen cases where e.g. vga fixes
break older guests but are required for security of the host) but you can try
with 1:2.10+dfsg-0ubuntu3.5 to swicth the machine type. Set -M to one of the
pc-q35-* types you can see with "kvm -M ?".
Does an older one of them work (you -M q35 cmdline defaults to the latest).
** Changed in: qemu (Ubuntu)
Status: New => Incomplete
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qemu-system-x86_64 broken on ubuntu 17.10
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