linux-kernel - Re: [PATCH] lib/test_lockup: test module to generate lockups

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Date:   Tue, 11 Feb 2020 11:21:29 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Dmitry Monakhov <dmtrmonakhov@...dex-team.ru>
Subject: Re: [PATCH] lib/test_lockup: test module to generate lockups

On Tue, Feb 11, 2020 at 03:57:42PM +0300, Konstantin Khlebnikov wrote:
> On 11/02/2020 04.26, Kees Cook wrote:
> > On Mon, Feb 10, 2020 at 12:56:31PM +0300, Konstantin Khlebnikov wrote:
> > > CONFIG_TEST_LOCKUP=m adds module "test_lockup" that helps to make sure
> > > that watchdogs and lockup detectors are working properly.
> > 
> > Isn't this all already possible with CONFIG_LKDTM ?
> 
> Yep, LKDTM covers some cases. But they are unrecoverable.
> 
> It seems LKDTM is more like a fixed set of unit tests while
> test_lockup is a flexible tool for stress load.

Okay, cool. I just wanted to make sure you'd seen LKDTM and there wasn't
too much wheel-reinvention happening. :) Thanks for checking!

-Kees

-- 
Kees Cook