gnome-shell crash then it consumes 100% cpu doing nothing at gdm/login
Fedora 28 (Rawhide) gnome-shell-3.27.1-5.fc28.x86_64 mutter-3.27.1-4.fc28.x86_64 clutter-1.26.2-1.fc27.x86_64 kernel-4.15.4-300.fc27.x86_64 Dual GPU with radeon graphics active, wayland session
Boot to gdm, without logging in, and first there's a gnome shell crash (or at least a coredump) and what remains is consuming 100% cpu.
I used gdb attach to maybe figure out what this 100%CPU hung process is doing, because strace records nothing at all.