linux-kernel - Re: NULL pointer dereference regression when running `chmod -R root:tracing /sys/kernel/debug/tracing`

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Message-ID: <20231112071439.188bcf4e@gandalf.local.home>
Date:   Sun, 12 Nov 2023 07:14:39 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     akaher@...are.com, akpm@...ux-foundation.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, mhiramat@...nel.org
Subject: Re: NULL pointer dereference regression when running `chmod -R
 root:tracing /sys/kernel/debug/tracing`

On Sun, 12 Nov 2023 11:41:58 +0100
Milian Wolff <milian.wolff@...b.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