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

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Message-Id: <3836DE34-9DD2-4815-9E1E-CB87D881B9AD@lca.pw>
Date:   Tue, 8 Oct 2019 08:00:43 -0400
From:   Qian Cai <cai@....pw>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Petr Mladek <pmladek@...e.com>, akpm@...ux-foundation.org,
        sergey.senozhatsky.work@...il.com, rostedt@...dmis.org,
        peterz@...radead.org, linux-mm@...ck.org,
        john.ogness@...utronix.de, david@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/page_isolation: fix a deadlock with printk()



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