linux-kernel - Re: [PATCH] lockdep: Avoid triggering hardlockup from debug_show_all

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Date:   Tue, 23 Jan 2018 21:54:38 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Tejun Heo <tj@...nel.org>, Rik van Riel <riel@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        kernel-team@...com,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH] lockdep: Avoid triggering hardlockup from
 debug_show_all_locks()

On Wed, 24 Jan 2018 11:49:55 +0900
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> wrote:

> Another problem, and I mentioned it somewhere in another email, is that
> upstream printk people don't receive enough [if any at all] feedback from
> guys who face printk issues. That's why every time printk_kthread re-surfaces
> the reaction is "this is not a real problem, no one is seeing printk issues
> like these, you idiot!". It'd be great to have more "we need ABC, because of
> XYZ, but printk crashes the system. Here is the backtrace, fix it" reports.
> As of now, those things mostly are not reported, that's why people are not
> convinced. Just my 5 cents.

If you are seeing these issues, have whoever is reporting them to Cc
LKML, and those of us that would care to listen.

-- Steve