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

[Qian Cai]

> On Oct 8, 2019, at 6:39 AM, Michal Hocko <mho...@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.