[bug report] blktests nvme/005 trigered debugfs: Directory 'hctx0' with parent '/' already present!

[Yi Zhang]

Hello
I found below error log when I ran blktests nvme/ tests on aarch64
with the latest linux-block/for-next,
Please help check it, and feel free to let me know if you need any
info/test for it, thanks.

[ 3814.423360] run blktests nvme/005 at 2022-07-08 07:38:17
[ 3814.565071] loop0: detected capacity change from 0 to 2097152
[ 3814.587169] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
[ 3814.601727] nvmet_tcp: enabling port 0 (127.0.0.1:4420)
[ 3814.626848] nvmet: creating nvm controller 1 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:90390a00-4597-11e9-b935-3c18a0043981.
[ 3814.642802] nvme nvme0: creating 32 I/O queues.
[ 3814.659147] nvme nvme0: mapped 32/0/0 default/read/poll queues.
[ 3814.675934] nvme nvme0: new ctrl: NQN "blktests-subsystem-1", addr
127.0.0.1:4420
[ 3815.906399] nvmet: creating nvm controller 2 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:90390a00-4597-11e9-b935-3c18a0043981.
[ 3815.921954] nvme nvme0: creating 32 I/O queues.
[ 3815.959703] nvme nvme0: mapped 32/0/0 default/read/poll queues.
[ 3815.966140] debugfs: Directory 'hctx0' with parent '/' already present!
[ 3815.972788] debugfs: Directory 'hctx1' with parent '/' already present!
[ 3815.979399] debugfs: Directory 'hctx2' with parent '/' already present!
[ 3815.986026] debugfs: Directory 'hctx3' with parent '/' already present!
[ 3815.992672] debugfs: Directory 'hctx4' with parent '/' already present!
[ 3815.999282] debugfs: Directory 'hctx5' with parent '/' already present!
[ 3816.005916] debugfs: Directory 'hctx6' with parent '/' already present!
[ 3816.013558] debugfs: Directory 'hctx7' with parent '/' already present!
[ 3816.020168] debugfs: Directory 'hctx8' with parent '/' already present!
[ 3816.026801] debugfs: Directory 'hctx9' with parent '/' already present!
[ 3816.033430] debugfs: Directory 'hctx10' with parent '/' already present!
[ 3816.040125] debugfs: Directory 'hctx11' with parent '/' already present!
[ 3816.046833] debugfs: Directory 'hctx12' with parent '/' already present!
[ 3816.056686] debugfs: Directory 'hctx13' with parent '/' already present!
[ 3816.063423] debugfs: Directory 'hctx14' with parent '/' already present!
[ 3816.070269] debugfs: Directory 'hctx15' with parent '/' already present!
[ 3816.077064] debugfs: Directory 'hctx16' with parent '/' already present!
[ 3816.083798] debugfs: Directory 'hctx17' with parent '/' already present!
[ 3816.090643] debugfs: Directory 'hctx18' with parent '/' already present!
[ 3816.097431] debugfs: Directory 'hctx19' with parent '/' already present!
[ 3816.104216] debugfs: Directory 'hctx20' with parent '/' already present!
[ 3816.110950] debugfs: Directory 'hctx21' with parent '/' already present!
[ 3816.117674] debugfs: Directory 'hctx22' with parent '/' already present!
[ 3816.124412] debugfs: Directory 'hctx23' with parent '/' already present!
[ 3816.131303] debugfs: Directory 'hctx24' with parent '/' already present!
[ 3816.138019] debugfs: Directory 'hctx25' with parent '/' already present!
[ 3816.144739] debugfs: Directory 'hctx26' with parent '/' already present!
[ 3816.151451] debugfs: Directory 'hctx27' with parent '/' already present!
[ 3816.158147] debugfs: Directory 'hctx28' with parent '/' already present!
[ 3816.164862] debugfs: Directory 'hctx29' with parent '/' already present!
[ 3816.171569] debugfs: Directory 'hctx30' with parent '/' already present!
[ 3816.178263] debugfs: Directory 'hctx31' with parent '/' already present!
[ 3816.209654] nvme nvme0: Removing ctrl: NQN "blktests-subsystem-1"
[ 3816.371107] block nvme0n1: no available path - failing I/O
[ 3816.376724] block nvme0n1: no available path - failing I/O
[ 3816.382227] Buffer I/O error on dev nvme0n1, logical block 0, async page read

[ 4508.175060] run blktests nvme/022 at 2022-07-08 07:49:51
[ 4508.308626] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
[ 4508.336571] nvmet_tcp: enabling port 0 (127.0.0.1:4420)
[ 4508.362149] nvmet: creating nvm controller 1 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:90390a00-4597-11e9-b935-3c18a0043981.
[ 4508.378077] nvme nvme0: creating 32 I/O queues.
[ 4508.394236] nvme nvme0: mapped 32/0/0 default/read/poll queues.
[ 4508.411370] nvme nvme0: new ctrl: NQN "blktests-subsystem-1", addr
127.0.0.1:4420
[ 4509.544769] nvme nvme0: resetting controller
[ 4509.652901] nvmet: creating nvm controller 2 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:90390a00-4597-11e9-b935-3c18a0043981.
[ 4509.668327] nvme nvme0: creating 32 I/O queues.
[ 4509.704724] nvme nvme0: mapped 32/0/0 default/read/poll queues.
[ 4509.711164] debugfs: Directory 'hctx0' with parent '/' already present!
[ 4509.717803] debugfs: Directory 'hctx1' with parent '/' already present!
[ 4509.724413] debugfs: Directory 'hctx2' with parent '/' already present!
[ 4509.731042] debugfs: Directory 'hctx3' with parent '/' already present!
[ 4509.737671] debugfs: Directory 'hctx4' with parent '/' already present!
[ 4509.744282] debugfs: Directory 'hctx5' with parent '/' already present!
[ 4509.750916] debugfs: Directory 'hctx6' with parent '/' already present!
[ 4509.757526] debugfs: Directory 'hctx7' with parent '/' already present!
[ 4509.764154] debugfs: Directory 'hctx8' with parent '/' already present!
[ 4509.770782] debugfs: Directory 'hctx9' with parent '/' already present!
[ 4509.777392] debugfs: Directory 'hctx10' with parent '/' already present!
[ 4509.784102] debugfs: Directory 'hctx11' with parent '/' already present!
[ 4509.790809] debugfs: Directory 'hctx12' with parent '/' already present!
[ 4509.797503] debugfs: Directory 'hctx13' with parent '/' already present!
[ 4509.804209] debugfs: Directory 'hctx14' with parent '/' already present!
[ 4509.810921] debugfs: Directory 'hctx15' with parent '/' already present!
[ 4509.817627] debugfs: Directory 'hctx16' with parent '/' already present!
[ 4509.824322] debugfs: Directory 'hctx17' with parent '/' already present!
[ 4509.831030] debugfs: Directory 'hctx18' with parent '/' already present!
[ 4509.837742] debugfs: Directory 'hctx19' with parent '/' already present!
[ 4509.844437] debugfs: Directory 'hctx20' with parent '/' already present!
[ 4509.852937] debugfs: Directory 'hctx21' with parent '/' already present!
[ 4509.859677] debugfs: Directory 'hctx22' with parent '/' already present!
[ 4509.866437] debugfs: Directory 'hctx23' with parent '/' already present!
[ 4509.873151] debugfs: Directory 'hctx24' with parent '/' already present!
[ 4509.879861] debugfs: Directory 'hctx25' with parent '/' already present!
[ 4509.886555] debugfs: Directory 'hctx26' with parent '/' already present!
[ 4509.893266] debugfs: Directory 'hctx27' with parent '/' already present!
[ 4509.899978] debugfs: Directory 'hctx28' with parent '/' already present!
[ 4509.906673] debugfs: Directory 'hctx29' with parent '/' already present!
[ 4509.913394] debugfs: Directory 'hctx30' with parent '/' already present!
[ 4509.920103] debugfs: Directory 'hctx31' with parent '/' already present!
[ 4509.954557] nvme nvme0: Removing ctrl: NQN "blktests-subsystem-1"
[ 4510.117886] block nvme0n1: no available path - failing I/O
[ 4510.123413] block nvme0n1: no available path - failing I/O
[ 4510.128913] Buffer I/O error on dev nvme0n1, logical block 0, async page read

-- 
Best Regards,
  Yi Zhang