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

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Date:   Tue, 11 Feb 2020 16:01:14 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Kees Cook <keescook@...omium.org>,
        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 11/02/2020 01.41, Andrew Morton wrote:
> On Mon, 10 Feb 2020 12:56:31 +0300 Konstantin Khlebnikov <khlebnikov@...dex-team.ru> wrote:
> 
>> CONFIG_TEST_LOCKUP=m adds module "test_lockup" that helps to make sure
>> that watchdogs and lockup detectors are working properly.
> 
> Now we'll get test robot reports "hey this makes my kernel lock up" ;)

Without module parameters it is completely save and does nothing.

> 
> Is there any way in which we can close the loop here?  Add a
> tools/testing/selftests script which loads the module, attempts to
> trigger a lockup and then checks whether it happened as expected?
> Sounds tricky.
> 

Yes, I'll try to script this.