nvmeof rdma regression issue on 4.14.0-rc1 (or maybe mlx4?)

[Sagi Grimberg]

> Hi Sagi
> With this patch, no such error log found on host side,


Awsome. that's the culprit...

> but I found there 
> is no nvme0n1 device node even get "nvme nvme0: Successfully 
> reconnected" on host.

That is expected because you did not persist a namespace UUID
which caused the kernel to generate a random one. That confused
the host as it got the same namespace ID with a different UUID.

Can you please set a uuid when you rerun the test?