From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 7DC28C4332F
	for <linux-kernel@archiver.kernel.org>; Sun, 12 Nov 2023 12:14:37 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S231406AbjKLMOi (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Sun, 12 Nov 2023 07:14:38 -0500
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47942 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S229441AbjKLMOg (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Sun, 12 Nov 2023 07:14:36 -0500
Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AF982D57
        for <linux-kernel@vger.kernel.org>; Sun, 12 Nov 2023 04:14:33 -0800 (PST)
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28A8AC433C8;
        Sun, 12 Nov 2023 12:14:32 +0000 (UTC)
Date:   Sun, 12 Nov 2023 07:14:39 -0500
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Milian Wolff <milian.wolff@kdab.com>
Cc:     akaher@vmware.com, akpm@linux-foundation.org,
        gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
        mark.rutland@arm.com, mhiramat@kernel.org
Subject: Re: NULL pointer dereference regression when running `chmod -R
 root:tracing /sys/kernel/debug/tracing`
Message-ID: <20231112071439.188bcf4e@gandalf.local.home>
In-Reply-To: <20231112104158.6638-1-milian.wolff@kdab.com>
References: <20231105160139.660634360@goodmis.org>
        <20231112104158.6638-1-milian.wolff@kdab.com>
X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sun, 12 Nov 2023 11:41:58 +0100
Milian Wolff <milian.wolff@kdab.com> wrote:

> Hey all,
> 
> this patch seems to have introduced a kernel bug causing
> a NULL pointer dereference when one runs:
> 
>     sudo chown -R root:tracing /sys/kernel/debug/tracing/
> 
> See the archlinux bug report I created initially for some more information:
> https://bugs.archlinux.org/task/80230
> 
> With 6.6.1 and 9aaee3eebc91dd9ccebf6b6bc8a5f59d04ef718b reverted,
> the above `chmod` command works. With a normal 6.6.1 build, or re-applying
> the patch again, the command fails and `dmesg` shows:

Thanks for the report. I'll work on it on my way to Plumbers.

-- Steve