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

[Sagi Grimberg]

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

Yi,

Does this happen with rxe? didn't see this in my test VM lately.

> 
> 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!--

Will have another look.