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

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Date:   Thu, 17 Jun 2021 19:17:23 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     linux-kernel@...r.kernel.org, io-uring@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>
Subject: [Bug] fio hang when running multiple job io_uring/hipri over nvme

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]

Thanks,