[dm-devel] [PATCH 0/7] dm-mpath: Fix a race condition in the blk-mq path

[Mike Snitzer]

On Tue, Nov 15 2016 at  7:57pm -0500,
Bart Van Assche <bart.vanassche at sandisk.com> wrote:

> On 11/15/2016 04:47 PM, Mike Snitzer wrote:
> >On Tue, Nov 15 2016 at  6:31pm -0500,
> >Bart Van Assche <bart.vanassche at sandisk.com> wrote:
> >>The seven patches in this series is what I came up with while
> >>reviewing and testing the dm-mpath single queue and multiqueue code.
> >>It would be appreciated if these patches would be considered for
> >>inclusion in the upstream kernel.
> >
> >This series seems like it is not a product of need.  But that of changes
> >that fell out from code review.
> >
> >If not, what test was failing that now passes with this patchset?
> 
> Hello Mike,
> 
> Without this patch series I see sporadic I/O errors when running I/O
> on top of dm-mq-on-mq. With this patch series my dm-mq-on-mq tests
> pass. However, I still see sporadic I/O errors being reported when I
> run I/O on top of dm-sq-on-mq and very sporadic I/O errors with my
> dm-sq-on-sq tests. It is not yet clear to me what is causing these
> I/O errors but it's probably something in either the dm core or the
> dm-mpath driver. My tests scripts are available at
> https://github.com/bvanassche/srp-test in case you would like to
> have a look.

I'm getting very tired of this.  Last I knew those tests pass.  Do you
keep changing the tests or something?

There is no change in this entire series that seems needed.  Exception
possibly being the patch 1/7 -- given you put so much pressure on DM
device teardown vs concurrent IO.

Please drop all but patch 1/7 and see if your tests pass.