From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 731A1C4167B for ; Tue, 14 Nov 2023 13:56:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229820AbjKNNzh (ORCPT ); Tue, 14 Nov 2023 08:55:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229504AbjKNNzf (ORCPT ); Tue, 14 Nov 2023 08:55:35 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F59F132 for ; Tue, 14 Nov 2023 05:55:31 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3090BC433C7; Tue, 14 Nov 2023 13:55:30 +0000 (UTC) Date: Tue, 14 Nov 2023 08:55:29 -0500 From: Steven Rostedt To: "Linux regression tracking #adding (Thorsten Leemhuis)" Cc: Linux regressions mailing list , Milian Wolff , 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: <20231114085529.77099439@rorschach.local.home> In-Reply-To: <2053f011-3c85-41e2-8685-1f46a2bc5fb8@leemhuis.info> References: <20231105160139.660634360@goodmis.org> <20231112104158.6638-1-milian.wolff@kdab.com> <2053f011-3c85-41e2-8685-1f46a2bc5fb8@leemhuis.info> X-Mailer: Claws Mail 3.17.8 (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: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 14 Nov 2023 14:38:57 +0100 "Linux regression tracking #adding (Thorsten Leemhuis)" wrote: > [TLDR: I'm adding this report to the list of tracked Linux kernel > regressions; the text you find below is based on a few templates > paragraphs you might have encountered already in similar form. > See link in footer if these mails annoy you.] > > On 12.11.23 11:41, Milian Wolff wrote: > > > > 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: > > Steven is already working on this, but to ensure the issue doesn't fall > through the cracks unnoticed, I'm adding it to regzbot, the Linux kernel > regression tracking bot (and from the context I assume it happens in > mainline as well) Note, the code in question was rewritten in 6.7 and the bug does not exist there. It only exists in 6.6 and I already sent Greg the patch, and he told me that it's in his queue. It's only a regression in 6.6 and not in mainline. -- Steve