linux-kernel - Re: [PATCH 3/3] panic: Allow printing extra panic information on kdump

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Date:   Wed, 22 Dec 2021 09:34:13 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Dave Young <dyoung@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, mcgrof@...nel.org,
        keescook@...omium.org, yzaikin@...gle.com,
        akpm@...ux-foundation.org, feng.tang@...el.com,
        siglesias@...lia.com, kernel@...ccoli.net,
        kexec@...ts.infradead.org
Subject: Re: [PATCH 3/3] panic: Allow printing extra panic information on
 kdump

On 22/12/2021 08:45, Dave Young wrote:
> Hi Guilherme,
> 
> Thanks for you patch.  Could you add kexec list for any following up
> patches?  This could change kdump behavior so let's see if any comments
> from kexec list.
> 
> Kudos for the lore+lei tool so that I can catch this by seeing this
> coming into Andrews tree :)

Hi Dave, I'm really sorry for not adding the kexec list, I forgot. But I
will do next time for sure, my apologies. And thanks for taking a look
after you noticed that on lore, I appreciate your feedback!

> [...]
> People may enable kdump crashkernel and panic_print together but
> they are not aware the extra panic print could cause kdump not reliable
> (in theory).  So at least some words in kernel-parameters.txt would
> help.
>  

That makes sense, I'll improve that in a follow-up patch, how about
that? Indeed it's a good idea to let people be sure that panic_print
might affect kdump reliability, although I consider the risk to be
pretty low. And I'll loop the kexec list for sure!

Cheers,


Guilherme