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

Jens Axboe
2021-11-25T21:07:37Z

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