[bug report] NVMe/IB: nvme disconnect -n testnqn need more than 1min

[Yi Zhang]

Hello

I found the nvme disconnect always needs more than 1min to be
finished, could anyone help check this issue?

Reproducer:
+ nvme connect -t rdma -a 172.31.0.202 -s 4420 -n testnqn

real    0m4.673s
user    0m0.000s
sys     0m0.005s
+ nvme disconnect -n testnqn
NQN:testnqn disconnected 1 controller(s)

real    1m9.028s
user    0m0.000s
sys     0m0.187s

client:
[  283.966930] nvme nvme0: creating 40 I/O queues.
[  288.527028] nvme nvme0: mapped 40/0/0 default/read/poll queues.
[  288.530501] nvme nvme0: new ctrl: NQN "testnqn", addr 172.31.0.202:4420
[  288.533203] nvme nvme0: Removing ctrl: NQN "testnqn"
[  357.534154] nvme nvme0: I/O 18 QID 0 timeout
[  357.539644] nvme nvme0: Property Set error: 881, offset 0x14target:

target:
[  229.016490] nvmet: adding nsid 1 to subsystem testnqn
[  229.044861] nvmet_rdma: enabling port 2 (172.31.0.202:4420)
[  280.697930] nvmet: creating nvm controller 1 for subsystem testnqn
for NQN nqn.2014-08.org.nvmexpress:uuid:4c4c4544-0056-4c10-8058-b7c04f383432.
[  291.155204] nvmet: ctrl 1 keep-alive timer (5 seconds) expired!
[  291.162238] nvmet: ctrl 1 fatal error occurred!--

HW:
04:00.0 Infiniband controller: Mellanox Technologies MT27700 Family [ConnectX-4]
04:00.1 Infiniband controller: Mellanox Technologies MT27700 Family [ConnectX-4]

Best Regards,
  Yi Zhang