nvmf/rdma host crash during heavy load and keep alive recovery

[Steve Wise]

> On Fri, Jul 29, 2016 at 04:40:40PM -0500, Steve Wise wrote:
> > Running many fio jobs on 10 NVMF/RDMA ram disks, and bringing down and back
> up
> > the interfaces in a loop uncovers this crash.  I'm not sure if this has been
> > reported/fixed?  I'm using the for-linus branch of linux-block + sagi's 5
> > patches on the host.
> >
> > What this test tickles is keep-alive recovery in the presence of heavy
> > raw/direct IO.  Before the crash there are logs of these logged, which is
> > probably expected:
> 
> With what fixes does this happen?  This looks pretty similar to an
> issue you reported before.

As I said, I'm using the for-linus branch of the linux-block repo
(git://git.kernel.dk/linux-block) + sagi's 5 recent patches.   So I should be
using the latest and greatest, I think.  This problem was originally seen on
nvmf-all.3 as well.  Perhaps I have reported this previously.  But now I'm
trying to fix it :)