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[2001:1c00:c1e:bf00:37a3:353b:be90:1238]) by smtp.gmail.com with ESMTPSA id x17sm9690450edd.76.2021.02.02.02.33.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Feb 2021 02:33:11 -0800 (PST) Subject: Re: 5.11 new lockdep warning related to led-class code (also may involve ata / piix controller) To: Pavel Machek Cc: Jens Axboe , Dan Murphy , linux-ide@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210112223015.GB28214@duo.ucw.cz> <0ec34bca-f7e0-8954-c253-d07ed6b71b80@redhat.com> <20210127220134.GC23419@amd> <20210202093228.GA29131@amd> From: Hans de Goede Message-ID: <46bcf09c-c4ac-e96b-1813-1798d36cd93d@redhat.com> Date: Tue, 2 Feb 2021 11:33:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210202093228.GA29131@amd> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Hi, On 2/2/21 10:32 AM, Pavel Machek wrote: > Hi! > >>> Is it a regression? AFAIK it is a bug that has been there >>> forever... My original plan was to simply wait for 5.12, so it gets >>> full release of testing... >> >> It may have been a pre-existing bug which got triggered by libata >> changes? > > Fixes tag suggests it is rather old. > >> I don't know. I almost always run all my locally build kernels with lockdep >> enabled and as the maintainer of the vboxvideo, vboxguest and vboxsf guest >> drivers in the mainline kernel I quite often boot local build kernels inside >> a vm. >> >> So I believe that lockdep tripping over this is new in 5.11, which is why >> I called it a regression. >> >> And the fix seems very safe and simple, so IMHO it would be good to get >> this into 5.11 > > It is in 5.11 now, and also -stable kernels. (Which suprised me a > bit). > > Testing would be welcome. I've been running my locally build kernels with this patch added for a while now. Including inside VirtualBox where the bug triggered before. I've not seen any bad side-effects from having this patch in my local kernels and I can confirm that it fixes the issue which I was seeing. Regards, Hans