target crash / host hang with nvme-all.3 branch of nvme-fabrics

[Steve Wise]

> > Which code-base is this? it looks like this code is just leaking queues.
> > Obviously something changed...
> >
> 
> Yoichi has hit what is apparently the same OOM bug:
> 
> Kernel panic - not syncing: Out of memory and no killable processes...
> 
> He hit it with NVMF on the host, _and_ with NVME/PCI with a local SSD.
> This is all with using nvmf-all.3 + Christoph's fix for the target queue
> deletion crash
> (http://lists.infradead.org/pipermail/linux-nvme/2016-June/005075.html).
> 

Yoichi can reproduce this with linux-4.7-rc4, so the issue isn't related to the
nvme/nvmf changes in nvmf-all.3.  Also, I have been unable to reproduce it so
far on my setup.  But Yoichi can reproduce it readily.

Steve.