same problem here. Tried with Ubuntu 17.10, Fedora 27. Wayland and Xorg with both distros. I can switch to a text-console ctrl-alt-f3 if I'm quick enough. top shows opera taking all cpu and gnome-shell eating memory fast. My machine has plenty of ram, but when gnome-shell starts to go to swap then the whole machine goes unresponsive. killing opera or gnome-shell resolves the problem.
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