linux-kernel - Re: [Bug] fio hang when running multiple job io

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Message-ID: <6691cf72-3a26-a1bb-228d-ddec8391620f@kernel.dk>
Date:   Thu, 17 Jun 2021 10:48:03 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Ming Lei <ming.lei@...hat.com>, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org
Subject: Re: [Bug] fio hang when running multiple job io_uring/hipri over nvme

On 6/17/21 5:17 AM, Ming Lei wrote:
> Hello,
> 
> fio hangs when running the test[1], and doesn't observe this issue
> when running a
> such single job test.
> 
> v5.12 is good, both v5.13-rc3 and the latest v5.13-rc6 are bad.
> 
> 
> [1] fio test script and log
> + fio --bs=4k --ioengine=io_uring --fixedbufs --registerfiles --hipri
> --iodepth=64 --iodepth_batch_submit=16
> --iodepth_batch_complete_min=16 --filename=/dev/nvme0n1 --direct=1
> --runtime=20 --numjobs=4 --rw=randread
> --name=test --group_reporting
> 
> test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
> 4096B-4096B, ioengine=io_uring, iodepth=64
> ...
> fio-3.25
> Starting 4 processes
> fio: filehash.c:64: __lookup_file_hash: Assertion `f->fd != -1' failed.
> fio: pid=1122, got signal=6
> ^Cbs: 3 (f=0): [f(1),r(1),K(1),r(1)][63.6%][eta 00m:20s]

Funky, would it be possible to bisect this? I'll see if I can reproduce.

-- 
Jens Axboe