linux-kernel - Re: stalling IO regression since linux 5.12, through 5.18

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Date:   Wed, 17 Aug 2022 22:53:29 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Chris Murphy <lists@...orremedies.com>
Cc:     Nikolay Borisov <nborisov@...e.com>, Jens Axboe <axboe@...nel.dk>,
        Jan Kara <jack@...e.cz>,
        Paolo Valente <paolo.valente@...aro.org>,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        Linux-RAID <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Josef Bacik <josef@...icpanda.com>
Subject: Re: stalling IO regression since linux 5.12, through 5.18

On Wed, Aug 17, 2022 at 10:34:38AM -0400, Chris Murphy wrote:
> 
> 
> On Wed, Aug 17, 2022, at 8:06 AM, Ming Lei wrote:
> 
> > blk-mq debugfs log is usually helpful for io stall issue, care to post
> > the blk-mq debugfs log:
> >
> > (cd /sys/kernel/debug/block/$disk && find . -type f -exec grep -aH . {} \;)
> 
> This is only sda
> https://drive.google.com/file/d/1aAld-kXb3RUiv_ShAvD_AGAFDRS03Lr0/view?usp=sharing

>From the log, there isn't any in-flight IO request.

So please confirm that it is collected after the IO stall is triggered.

If yes, the issue may not be related with BFQ, and should be related
with blk-cgroup code.


Thanks,
Ming