[PATCH v2] sched/core: fix illegal RCU from offline CPUs

[Paul E. McKenney]

On Thu, Apr 02, 2020 at 12:19:54PM -0400, Qian Cai wrote:
> 
> 
> > On Apr 2, 2020, at 11:54 AM, Paul E. McKenney <paulmck at kernel.org> wrote:
> > 
> > I do run this combination quite frequently, but only as part of
> > rcutorture, which might not be a representative workload.  For one thing,
> > it has a minimal userspace consisting only of a trivial init program.
> > I don't recall having ever seen this.  (I have seen one recent complaint
> > about an IPI being sent to an offline CPU, but I cannot prove that this
> > was not due to RCU bugs that I was chasing at the time.)
> 
> Yes, a trivial init is tough while running systemd should be able to catch it as it will use cgroup.

Not planning to add systemd to my rcutorture runs.  ;-)

							Thanx, Paul