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Date: Mon, 4 Dec 2017 17:21:08 +0100
From: Christoph Hellwig <hch@lst.de>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Bart Van Assche <Bart.VanAssche@wdc.com>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.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: <20171204162108.GA12482@lst.de>
References: <a1d51b13-c034-e0c8-9428-e360b2c898c3@kernel.dk> <20171123143453.GA29715@lst.de> <cdca47a9-05cc-2676-57fe-904ce8ad5fbc@de.ibm.com> <20171123182542.GA2680@lst.de> <899f1638-cca4-28e6-3225-51505a053d45@de.ibm.com> <20171123183232.GA2845@lst.de> <92ef1aae-90b5-f14f-390e-bfab97899431@de.ibm.com> <419d8565-9cbe-16ac-3d5d-5945098694bc@de.ibm.com> <20171127155409.GA6937@lst.de> <d0f39408-b697-8d1a-2cce-b833cb8fa118@de.ibm.com>
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On Wed, Nov 29, 2017 at 08:18:09PM +0100, Christian Borntraeger wrote:
> Works fine under KVM with virtio-blk, but still hangs during boot in an LPAR.
> FWIW, the system not only has scsi disks via fcp but also DASDs as a boot disk.
> Seems that this is the place where the system stops. (see the sysrq-t output
> at the bottom).

Can you check which of the patches in the tree is the culprit?