linux-kernel - Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)

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Date:   Thu, 23 Nov 2017 15:47:28 +0100
From:   Christoph Hellwig <hch@....de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Bart Van Assche <Bart.VanAssche@....com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with
        virtio-blk (also 4.12 stable)

[fullquote deleted]

> What will happen for the CPU hotplug case?
> Wouldn't we route I/O to a disabled CPU with this patch?

Why would we route I/O to a disabled CPU (we generally route
I/O to devices to start with).  How would including possible
but not present cpus change anything?