[dm-devel] Fix "dm kcopyd: Fix bug causing workqueue stalls" causes dead lock

[Mike Snitzer]

On Tue, Oct 01 2019 at  8:43am -0400,
Nikos Tsironis <ntsironis at arrikto.com> wrote:

> On 10/1/19 3:27 PM, Guruswamy Basavaiah wrote:
> > Hello Nikos,
> >  Yes, issue is consistently reproducible with us, in a particular
> > set-up and test case.
> >  I will get the access to set-up next week, will try to test and let
> > you know the results before end of next week.
> > 
> 
> That sounds great!
> 
> Thanks a lot,
> Nikos

Hi Guru,

Any chance you could try this fix that I've staged to send to Linus?
https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-5.4&id=633b1613b2a49304743c18314bb6e6465c21fd8a

Shiort of that, Nikos: do you happen to have a test scenario that teases
out this deadlock?

Thanks,
Mike