linux-kernel - Re: [RFC PATCH] nvme: prevent hang on surprise removal of NVMe disk

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Message-ID: <da0e1493-bdfb-f510-7cf9-ffbf4baf6159@suse.de>
Date:   Wed, 16 Feb 2022 07:39:24 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Christoph Hellwig <hch@....de>,
        Markus Blöchl <markus.bloechl@...tronik.com>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stefan Roese <sr@...x.de>
Subject: Re: [RFC PATCH] nvme: prevent hang on surprise removal of NVMe disk

On 2/15/22 20:17, Christoph Hellwig wrote:
> On Mon, Feb 14, 2022 at 10:51:07AM +0100, Markus Blöchl wrote:
>> After the surprise removal of a mounted NVMe disk the pciehp task
>> reliably hangs forever with a trace similar to this one:
> 
> Do you have a specific reproducer? At least with doing a
> 
> echo 1 > /sys/.../remove
> 
> while running fsx on a file system I can't actually reproduce it.

You should be able to reproduce it doing a PCI hotplug from qemu.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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