linux-ext4 - Re: Write I/O queue hangup at random on recent Linus' kernels

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Message-ID: <17206ea6-506d-b1de-09e8-c935ff308bd6@kernel.dk>
Date:   Thu, 25 Nov 2021 14:07:29 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     "Kenneth R. Crudup" <kenny@...ix.com>
Cc:     linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nvme@...ts.infradead.org
Subject: Re: Write I/O queue hangup at random on recent Linus' kernels

On 11/25/21 2:05 PM, Kenneth R. Crudup wrote:
> 
> On Tue, 23 Nov 2021, Jens Axboe wrote:
> 
>> It looks like some missed accounting. You can just disable wbt for now, would
>> be a useful data point to see if that fixes it. Just do:
> 
>> echo 0 > /sys/block/nvme0n1/queue/wbt_lat_usec
> 
>> and that will disable writeback throttling on that device.
> 
> It's been about 48 hours and haven't seen the issue since doing this.

Great, thanks for verifying. From your report 5.16-rc2 has the issue, is
5.15 fine?

-- 
Jens Axboe