linux-kernel - [bug report] nvme: fio workload hangs on 16m random read

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Message-ID: <87a59x6g5u.fsf@kernel.org>
Date: Thu, 06 Mar 2025 21:46:37 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Keith Busch <kbusch@...nel.org>,Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>,Sagi Grimberg <sagi@...mberg.me>,
	linux-nvme@...ts.infradead.org,linux-kernel@...r.kernel.org
Subject: [bug report] nvme: fio workload hangs on 16m random read

Hi All,

My CI system has found an issue for the following fio workload:

root@...ian:~# insmod /mnt/v6.14-rc5-build/drivers/nvme/host/nvme-core.ko
root@...ian:~# insmod /mnt/v6.14-rc5-build/drivers/nvme/host/nvme.ko poll_queues=1

"fio" "--group_reporting" "--name=default" "--filename=/dev/nvme0n1"
"--readwrite=randread" "--blocksize=16777216" "--direct=1" "--numjobs=1"
"--ioengine=io_uring" "--iodepth=1" "--hipri=1" "--time_based=1"
"--runtime=3000"

fio will hang, some times immediately, some times after a few minutes.

I observed this on v6.14-rc1 and v6.14-rc5. It is not present in v6.13.

Can any of you reproduce this? I was able to reproduce this on real
hardware and in qemu.


Best regards,
Andreas Hindborg