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

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Message-Id: <35f0d608-7448-4276-8922-19a23d8f9049@www.fastmail.com>
Date:   Wed, 17 Aug 2022 12:34:42 -0400
From:   "Chris Murphy" <lists@...orremedies.com>
To:     "Ming Lei" <ming.lei@...hat.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 11:34 AM, Ming Lei wrote:

> From the 2nd log of blockdebugfs-all.txt, still not see any in-flight IO on
> request based block devices, but sda is _not_ included in this log, and
> only sdi, sdg and sdf are collected, is that expected?

While the problem was happening I did

cd /sys/kernel/debug/block
find . -type f -exec grep -aH . {} \;

The file has the nodes out of order, but I don't know enough about the interface to see if there are things that are missing, or what it means.


> BTW, all request based block devices should be observed in blk-mq debugfs.

/sys/kernel/debug/block contains

drwxr-xr-x.  2 root root 0 Aug 17 15:20 md0
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sda
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdb
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdc
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdd
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sde
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdf
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdg
drwxr-xr-x. 51 root root 0 Aug 17 15:20 sdh
drwxr-xr-x.  4 root root 0 Aug 17 15:20 sdi
drwxr-xr-x.  2 root root 0 Aug 17 15:20 zram0


-- 
Chris Murphy