[bug report] nvme0n1 node still exists after blktests nvme-tcp/014 on 5.13.16-rc1

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Hello
I found this failure on stable 5.13.16-rc1[1] and cannot reproduce it
on 5.14, seems we are missing commit[2] on 5.13.y, could anyone help
check it?

[1]
# nvme_trtype=tcp ./check nvme/014
nvme/014 (flush a NVMeOF block device-backed ns)             [passed]
    runtime  30.745s  ...  22.110s
# lsblk
NAME    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda       8:0    0 465.8G  0 disk
├─sda1    8:1    0     1G  0 part /boot
├─sda2    8:2    0    16G  0 part /mnt/dmtest/data
├─sda3    8:3    0    15G  0 part /mnt/xfstests/mnt1
├─sda4    8:4    0     1K  0 part
├─sda5    8:5    0    15G  0 part /mnt/xfstests/mnt2
├─sda6    8:6    0   7.9G  0 part [SWAP]
├─sda7    8:7    0     5G  0 part /mnt/xfstests/logwrites
├─sda8    8:8    0     1G  0 part /mnt/dmtest/metadata
└─sda9    8:9    0 404.9G  0 part /
zram0   252:0    0     8G  0 disk [SWAP]
nvme0n1 259:3    0     1G  0 disk

[  133.791507] run blktests nvme/014 at 2021-09-12 08:08:17
[  133.908750] loop0: detected capacity change from 0 to 2097152
[  133.927551] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
[  133.942518] nvmet_tcp: enabling port 0 (127.0.0.1:4420)
[  133.977746] nvmet: creating controller 1 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:c4c5023e9bcd4cb5889e9510622eb88c.
[  133.994170] nvme nvme0: creating 4 I/O queues.
[  133.999881] nvme nvme0: mapped 4/0/0 default/read/poll queues.
[  134.008683] nvme nvme0: new ctrl: NQN "blktests-subsystem-1", addr
127.0.0.1:4420
[  151.223049] nvme nvme0: using deprecated NVME_IOCTL_IO_CMD ioctl on
the char device!
[  155.675634] nvme nvme0: Removing ctrl: NQN "blktests-subsystem-1"
[  155.682902] block nvme0n1: no available path - failing I/O
[  155.689137] block nvme0n1: no available path - failing I/O
[  155.695295] Buffer I/O error on dev nvme0n1, logical block 32,
async page read

[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5396fdac56d87d04e75e5068c0c92d33625f51e7
5396fdac56d8 nvme: fix refcounting imbalance when all paths are down


-- 
Best Regards,
  Yi Zhang





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