From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 23 Nov 2017 15:02:08 +0100
From: Christoph Hellwig <hch@lst.de>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Jens Axboe <axboe@kernel.dk>, Bart Van Assche <Bart.VanAssche@wdc.com>,
	"virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"mst@redhat.com" <mst@redhat.com>,
	"jasowang@redhat.com" <jasowang@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with
	virtio-blk (also 4.12 stable)
Message-ID: <20171123140208.GA28914@lst.de>
References: <04526c98-ffc5-1eca-3aa8-50f9212c4323@de.ibm.com> <5c9f2228-0a8b-8225-7038-e6cb3f31ca0b@kernel.dk> <2e44dbd3-2f90-c267-560c-91d1d4b0e892@de.ibm.com> <823b9dd5-7781-5a72-03ff-bc931433fc19@kernel.dk> <bd928410-4d38-603e-00c9-4c4db20d8e86@de.ibm.com> <15f232d2-2aaa-df7c-57e8-2f710e051e84@de.ibm.com> <c8bd769e-9742-205d-11b0-469428a8579c@de.ibm.com> <b7b3cf4b-837e-f9ba-61c0-4f9ddd8b9a95@kernel.dk> <055f040d-3f9a-a8fd-e8e2-326c6b9094a1@kernel.dk> <1aeecf2e-a68e-4c18-5912-2473f457e6ea@de.ibm.com>
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List-ID: <linux-block@vger.kernel.org>

I can't reproduce it in my VM with adding a new CPU.  Do you have
any interesting blk-mq like actually using multiple queues?  I'll
give that a spin next.