linux-kernel - Re: [PATCH 2/2] block: hold queue lock while iterating in diskstats

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Date:   Thu, 20 Jan 2022 17:29:49 +0100
From:   Daniel Wagner <dwagner@...e.de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH 2/2] block: hold queue lock while iterating in
 diskstats_show

On Thu, Jan 20, 2022 at 11:37:00PM +0800, Ming Lei wrote:
> Seems more likely nvme recovery issue, tags is changed even though
> ->q_usage_counter is grabbed in blk_mq_queue_tag_busy_iter(), which is
> added in v4.19.
> 
> You may check dmesg log and see if there is any nvme error recovery info.

Thanks for the tip. It's likely that a recovery is running although
there is no entry in the logs. At least I have an idea what could be the
problem here.