[dm-devel] Kernel v4.1-rc1 + MQ dm-multipath + MQ SRP oops

[Christoph Hellwig]

On Tue, Apr 28, 2015 at 05:54:57PM -0400, Mike Snitzer wrote:
> Turns out that after running hch's script, with multipathd having setup
> an mpath device ontop of tcm_loop, if I just do:
> 
> tcm_loop --unload
> 
> (tcm_loop appears to allow me to remove the devices out from underneath dm-multipath)

That has nothing to do with tcm_loop.  SCSI devices can get unregistered
any time, and we use refcountin to ensure the structures stay in place
forever.

See my reply to Bart for what I suspect is the real issue.