linux-kernel - Re: [PATCH v1] kthread/smpboot: Serialize kthread parking against wakeup

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Date:   Wed, 6 Jun 2018 17:03:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     "Kohli, Gaurav" <gkohli@...eaurora.org>, tglx@...utronix.de,
        mpe@...erman.id.au, mingo@...nel.org, bigeasy@...utronix.de,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Will Deacon <will.deacon@....com>
Subject: Re: [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 :/