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

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Date:   Thu, 15 Jul 2021 14:31:46 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Juri Lelli <jlelli@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        He Zhe <zhe.he@...driver.com>
Subject: Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal()

On 7/15/21 12:22 PM, Hillf Danton wrote:
>> the lock needs to be per-pcu... but so far, so good. I will continue using the
>> system in the next days to see if it blows on another way.
> Curiou, is it so good as to see the warning no longer printed? Or your
> box still works even with the warning in log?
> 

Without the patch:

	- warn on dmesg
	- I lose my connection with VM (as a side effect)

With the patch:
	- no warn
	- continue using the VM normally...

-- Daniel