linux-kernel - Re: system hung up when offlining CPUs

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Date:   Mon, 21 Aug 2017 14:07:37 +0200
From:   Christoph Hellwig <hch@....de>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     YASUAKI ISHIMATSU <yasu.isimatu@...il.com>, tglx@...utronix.de,
        axboe@...nel.dk, mpe@...erman.id.au, keith.busch@...el.com,
        peterz@...radead.org, LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: system hung up when offlining CPUs

Hi Marc,

in general the driver should know not to use the queue / irq,
as blk-mq will never schedule I/O to queues that have no online
cpus.

The real bugs seems to be that we're using affinity for a device
that only has one real queue (as the config queue should not
have affinity).  Let me dig into what's going on here with virtio.