Re: [PATCH v2] mm/page_isolation: fix a deadlock with printk()

[Michal Hocko]

On Tue 08-10-19 08:00:43, Qian Cai wrote:
> 
> 
> > On Oct 8, 2019, at 6:39 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> > 
> > Have you actually triggered any real deadlock? With a zone->lock in
> > place it would be pretty clear with hard lockups detected.
> 
> Yes, I did trigger here and there, and those lockdep splats are
> especially useful to figure out why.

Can you provide a lockdep splat from an actual deadlock please? I am
sorry but your responses tend to be really cryptic and I never know when
you are talking about actual deadlocks and lockdep splats. I have asked
about the former several times never receiving a specific answer.
-- 
Michal Hocko
SUSE Labs