Am Wed, 5 Sep 2018 17:14:48 +0200 schrieb Juergen Gross : > I'm not sure this WARN triggers because it is cpu#0. Are you sure > the tested cpu in that WARN was 0? After all the test is just running > on cpu#0 and I don't think it can be offline already. If I leave cpu#0 alone, no WARN is triggered. I resend with test cpu_is_hotpluggable. Olaf