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Date:   Thu, 25 Nov 2021 14:07:29 -0700
From:   Jens Axboe <>
To:     "Kenneth R. Crudup" <>
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

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