Hi Steven, I get an oops with current linux.git when I am doing "echo function_graph > current_tracer" inside a kvm guest. Oopses do not contain much useful information and they are always different. Looks like stack corruption (at least this is what Oopses say when not triple faulting). Attached is my guest kernel .config. I do not have the same problem on the host, but kernel config is different there. -- Gleb.