[dm-devel] CONFIG_DM_MQ_DEFAULT makes my kernel unhappy..
Mike Snitzer
snitzer at redhat.com
Mon Apr 27 19:03:19 UTC 2015
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.
I'm not seeing any warnings with use_blk_mq=Y but I don't have
CONFIG_DEBUG_OBJECTS set. I expected to still see the later errors you
saw though. Unfortunately (or fortunately? ;) I'm not... with 4.1-rc1
on a pretty fast bare-metal system.
Since you can easily reproduce you might need to chase down the problem.
BTW, I'm liking LIO and these lio-utils for quick test setups.. much
more useful than scsi_debug!
For now I'll move on to reviewing/testing your v2 patch.
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