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SubjectRe: [PATCH v1] kthread/smpboot: Serialize kthread parking against wakeup
On Wed, Jun 06, 2018 at 03:51:16PM +0200, Oleg Nesterov wrote:
> In particular, I think that kthread_park() on a parked kthread
> must not be possible.

It happens though; I put in a WARN and someone triggered it -- although
I could not reproduce :/

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