[dm-devel] CONFIG_DM_MQ_DEFAULT makes my kernel unhappy..

[Mike Snitzer]

On Sun, Apr 26 2015 at 10:16am -0400,
Christoph Hellwig <hch at infradead.org> wrote:

> On Sat, Apr 25, 2015 at 08:37:32AM -0700, Christoph Hellwig wrote:
> > I'll give it a spin.
> > 
> > > What were you actually testing when this happened?  Were you failing
> > > paths under IO load or something?
> > 
> > This happened on the initial udev-direct scan of the devices.
> > 
> > > Also, which upstream commit was your tree based on?  Did you have any
> > > non-upstream patches applied that I should be aware of?
> > 
> > Latest Linus tree as of this morning.
> 
> Seems like the first warning goes away without CONFIG_DEBUG_OBJECTS.
> Note that in either way I/O over dm-mpath actually works fine.
> 
> Btw, this is the script used to reproduce it, you need
> CONFIG_TARGET_CORE, CONFIG_TCM_IBLOCK and CONFIG_LOOPBACK_TARGET
> enabled.  It jsut creates two different targets with a lun each,
> pointing to the same device.  The target code automatically supports
> ALUA in this case.
> 
> ---
> #!/bin/bash
> 
> # add your own device
> #DEV=/dev/sda
> 
> mount -t configfs none /sys/kernel/config/
> 
> tcm_node --block iblock_0/array /dev/sda
> 
> line=$(tcm_loop --createnexus=0)
> wwn=$(echo $line | awk '{print $15}')
> tcm_loop --addlun=$wwn 0 0 iblock_0/array
> 
> line=$(tcm_loop --createnexus=1)
> wwn=$(echo $line | awk '{print $15}')
> tcm_loop --addlun=$wwn 1 0 iblock_0/array
> 

So you're still using lio-utils?  Seems "lio-utils are deprecated and
have been superseded by targetcli".. what am I missing?

What lio-utils repo should I be using to get the utils that'll work with
your script?