linux-kernel - Re: [RFC] How to test panic handlers, without crashing the kernel

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Date: Thu, 7 Mar 2024 14:30:05 -0300
From: "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To: Jocelyn Falempe <jfalempe@...hat.com>,
 Michael Kelley <mhklinux@...look.com>,
 John Ogness <john.ogness@...utronix.de>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Daniel Vetter <daniel@...ll.ch>, Andrew Morton <akpm@...ux-foundation.org>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Kefeng Wang <wangkefeng.wang@...wei.com>, Lukas Wunner <lukas@...ner.de>,
 Uros Bizjak <ubizjak@...il.com>, Petr Mladek <pmladek@...e.com>,
 Daniel Thompson <daniel.thompson@...aro.org>,
 Douglas Anderson <dianders@...omium.org>
Cc: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 David Airlie <airlied@...hat.com>, Thomas Zimmermann <tzimmermann@...e.de>
Subject: Re: [RFC] How to test panic handlers, without crashing the kernel

On 07/03/2024 14:22, Jocelyn Falempe wrote:
> [...]
> 
> For drm_panic, I changed the way the debugfs is calling the drm_panic 
> functions in the last version:
> https://patchwork.freedesktop.org/patch/581845/?series=122244&rev=9
> 
> It doesn't use the panic notifier list, but create a file for each plane 
> of each device directly.
> It allows to test the panic handler, not in a real panic condition, but 
> that's still better than nothing.
> 

Nice! Seems a very good idea, at least as a first step to unblock the
work you're doing.

Thanks again for the effort, much appreciated =)