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

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Date:   Thu, 18 Aug 2022 00:18:29 -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 Thu, Aug 18, 2022, at 12:12 AM, Chris Murphy wrote:
> On Wed, Aug 17, 2022, at 11:41 PM, Ming Lei wrote:
>
>> OK, can you post the blk-mq debugfs log after you trigger it on v5.17?
>
> https://drive.google.com/file/d/1n8f66pVLCwQTJ0PMd71EiUZoeTWQk3dB/view?usp=sharing
>
> This time it happened pretty quickly. This log is soon after triple 
> digit load and no IO, but not as fully developed as before. The system 
> has become entirely unresponsive to new commands, so I have to issue 
> sysrq+b - if I let it go too long even that won't work.

OK by the time I clicked send, the system had recovered. That also sometimes happens but then later IO stalls again and won't recover.  So I haven't issued sysrq+b on this run yet. Here is a second blk-mq debugfs log...

https://drive.google.com/file/d/1irHcns0qe7e7DJaDfanX8vSiqE1Nj5xl/view?usp=sharing


-- 
Chris Murphy