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Date:   Mon, 4 Dec 2017 17:21:08 +0100
From:   Christoph Hellwig <hch@....de>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        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)

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?

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