netdev - Re: WARNING in hrtimer

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Message-ID: <87y2kuj887.fsf@nanos.tec.linutronix.de>
Date:   Mon, 28 Sep 2020 16:18:00 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Hillf Danton <hdanton@...a.com>,
        syzbot <syzbot+ca740b95a16399ceb9a5@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Hillf Danton <hdanton@...a.com>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in hrtimer_forward

On Sun, Sep 27 2020 at 16:04, Hillf Danton wrote:
> Sat, 26 Sep 2020 17:38:16 -0700
>
> Dunno if it's down to memory barrier.
>
> --- a/kernel/time/hrtimer.c
> +++ b/kernel/time/hrtimer.c
> @@ -929,7 +929,7 @@ u64 hrtimer_forward(struct hrtimer *time
>  	if (delta < 0)
>  		return 0;
>  
> -	if (WARN_ON(timer->state & HRTIMER_STATE_ENQUEUED))
> +	if (WARN_ON(hrtimer_is_queued(timer)))
>  		return 0;

The point of that exercise is?