Re: [io_uring]: fio's ./t/io_uring on /dev/nullb0 causing CPU stalls

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To: "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>
Subject: Re: [io_uring]: fio's ./t/io_uring on /dev/nullb0 causing CPU stalls
From: "Stephen Bates" <sbates@xxxxxxxxxxxx>
Date: Fri, 21 Jun 2019 12:06:10 +0000
Accept-language: en-CA, en-US
Cc: Jens Axboe <axboe@xxxxxxxxx>, "fio-owner@xxxxxxxxxxxxxxx" <fio-owner@xxxxxxxxxxxxxxx>
In-reply-to: <02CA47A4-B51C-4393-9C90-8EAFFE825669@raithlin.com>
References: <02CA47A4-B51C-4393-9C90-8EAFFE825669@raithlin.com>
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Hi 

> I hit the following BUG when testing fio's t/io_uring test on a null block device

I confirmed the same BUG occurs on 5.2-rc5. I also managed to hit a similar bug if I use the io_uring engine in fio but only when the hipri engine option is enabled. 

Stephen

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- [io_uring]: fio's ./t/io_uring on /dev/nullb0 causing CPU stalls
  - From: Stephen Bates

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