linux-kernel - Re: [PATCH v9 8/8] blk-mq-debugfs: warn about possible deadlock

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Message-ID: <202602061756.96736e8f-lkp@intel.com>
Date: Fri, 6 Feb 2026 17:26:54 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Yu Kuai <yukuai@...as.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Nilay Shroff
	<nilay@...ux.ibm.com>, Ming Lei <ming.lei@...hat.com>, Hannes Reinecke
	<hare@...e.de>, <linux-block@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>,
	<linux-kernel@...r.kernel.org>, <yukuai@...as.com>, <oliver.sang@...el.com>
Subject: Re: [PATCH v9 8/8] blk-mq-debugfs: warn about possible deadlock



Hello,

kernel test robot noticed "blktests.nvme/040.fail" on:

commit: a228828b6a29e3787c2d4f30b966b4e723436491 ("[PATCH v9 8/8] blk-mq-debugfs: warn about possible deadlock")
url: https://github.com/intel-lab-lkp/linux/commits/Yu-Kuai/blk-wbt-factor-out-a-helper-wbt_set_lat/20260202-161435
base: https://git.kernel.org/cgit/linux/kernel/git/axboe/linux.git for-next
patch link: https://lore.kernel.org/all/20260202080523.3947504-9-yukuai@fnnas.com/
patch subject: [PATCH v9 8/8] blk-mq-debugfs: warn about possible deadlock

in testcase: blktests
version: blktests-x86_64-5885dee-1_20260203
with following parameters:

	disk: 1SSD
	test: nvme-040
	nvme_trtype: rdma
	use_siw: true


config: x86_64-rhel-9.4-func
compiler: gcc-14
test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480+ (Sapphire Rapids) with 256G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202602061756.96736e8f-lkp@intel.com


2026-02-04 16:08:35 cd /lkp/benchmarks/blktests
2026-02-04 16:08:35 mkdir -p /mnt/nvme-040
2026-02-04 16:08:35 mount /dev/nvme0n1p1 /mnt/nvme-040
2026-02-04 16:08:35 echo nvme/040
2026-02-04 16:08:35 ./check -o /mnt/nvme-040 nvme/040
nvme/040 (tr=rdma) (test nvme fabrics controller reset/disconnect operation during I/O)
    runtime  8.568s  ...
nvme/040 (tr=rdma) (test nvme fabrics controller reset/disconnect operation during I/O) [failed]
    runtime  8.568s  ...  8.988s
    something found in dmesg:
    [  161.504240] [   T3651] run blktests nvme/040 at 2026-02-04 16:08:36
    [  161.567237] [   T4057] loop0: detected capacity change from 0 to 2097152
    [  161.581589] [   T4062] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
    [  161.598986] [   T4067] iwpm_register_pid: Unable to send a nlmsg (client = 2)
    [  161.608814] [   T4067] nvmet_rdma: enabling port 0 (192.168.3.121:4420)
    [  161.658405] [   T1863] nvmet: Created nvm controller 1 for subsystem blktests-subsystem-1 for NQN nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349.
    [  161.686065] [   T4074] nvme nvme2: creating 128 I/O queues.
    [  162.191928] [   T4074] nvme nvme2: mapped 128/0/0 default/read/poll queues.
    [  162.263779] [   T4074] nvme nvme2: new ctrl: NQN "blktests-subsystem-1", addr 192.168.3.121:4420, hostnqn: nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349
    [  162.358452] [   T4108] block nvme0n1: No UUID available providing old NGUID
    ...
    (See '/mnt/nvme-040/nodev_tr_rdma/nvme/040.dmesg' for the entire message)



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260206/202602061756.96736e8f-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki