Comment 8 for bug 1365163

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Anders Kaseorg (andersk) wrote : Re: apparmor breaks virt-manager creation [qemu-system-x86_64 crashed with SIGABRT in spice_logv()]

Aha, that must be it: when booting with init=/lib/systemd/systemd, /run/shm is a symlink to /dev/shm, not the other way around.