linux-kernel - Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd

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Message-ID: <87im14cemr.ffs@nanos.tec.linutronix.de>
Date:   Wed, 21 Jul 2021 09:25:32 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Hillf Danton <hdanton@...a.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Michael S. Tsirkin" <mst@...hat.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal()

On Wed, Jul 21 2021 at 15:04, Hillf Danton wrote:
>
> But the preempting waker can not make sense without the waiter who is bloody
> special. Why is it so in the first place? Or it is not at all but the race
> existing from Monday to Friday.

See the large comment in eventfd_poll().