nvmet_rdma crash - DISCONNECT event with NULL queue

['Christoph Hellwig']

On Wed, Nov 02, 2016 at 10:07:38AM -0500, Steve Wise wrote:
> I'm not sure I understand the "subsystem" concept.  I never noticed before that
> any target device had the same controller ID.  The target json config file is
> inserted below.  There are 10 ramdisks exported over 2 ports of a cxgb4 40GE
> device and 1 port of an mlx4 RoCE device.   For this test, the NVMF host
> connects to all 10 targets over 1 port of the cxgb4 device.  Like this:

Yes, you have multiple subsystems.  It's sort of the NVMe equivalent
of a target which can have multiple LUNs, aka Namespaces in NVMe.

Btw, I want to actually make the ctrlid global for the target instead of
per-subsystem to ease a few things, and debuggability is just one more
on the list.