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    SubjectRe: WARN_ON_ONCE() in process_one_work()?
    Hello, Paul.

    On Mon, May 01, 2017 at 11:38:07AM -0700, Paul E. McKenney wrote:
    > On Mon, May 01, 2017 at 09:57:47AM -0700, Paul E. McKenney wrote:
    > > Hello!
    > >
    > > I am hitting this WARN_ON_ONCE() in process_one_work() and am wondering
    > > what I did wrong to make this happen:
    >
    > Oh, wait... Rescuer, it says. Might this be due to the fact that RCU's
    > expedited grace periods block within a workqueue handler? Might this
    > in turn run the system out of workqueue kthreads? If this is the likely
    > cause, my approach would be to rework the expected-grace-period workqueue
    > handler to return when waiting for the grace period to complete, and to
    > replace the current wakeup with a schedule_work() or something similar.

    That should be completely fine. It could just be that the rescuer
    path has a bug around CPU hotplug handling. Can you please confirm
    either way on the cpuset usage?

    Thanks.

    --
    tejun

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