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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To: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Subject: Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 4 Dec 2017 17:21:08 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Bart Van Assche <Bart.VanAssche@xxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
In-reply-to: <d0f39408-b697-8d1a-2cce-b833cb8fa118@de.ibm.com>
User-agent: Mutt/1.5.17 (2007-11-01)

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?

Follow-Ups:
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger

References:
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Jens Axboe
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christoph Hellwig
- Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)
  - From: Christian Borntraeger

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