Re: [PATCH v2] mm/page_isolation: fix a deadlock with printk()
From: Qian Cai
Date: Tue Oct 08 2019 - 08:00:47 EST
> 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.