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

Michal Hocko
2019-10-08T12:39:24Z

On Tue 08-10-19 08:00:43, Qian Cai wrote:
>
>
> > On Oct 8, 2019, at 6:39 AM, Michal Hocko <mhocko@kernel.org> 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