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 X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E42BEC433E0 for ; Wed, 13 Jan 2021 09:01:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CA012339F for ; Wed, 13 Jan 2021 09:01:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727398AbhAMJBQ (ORCPT ); Wed, 13 Jan 2021 04:01:16 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:54848 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbhAMJBP (ORCPT ); Wed, 13 Jan 2021 04:01:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610528388; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QuTRToQJZ9ENJOQ+foe03ejm+/o+GM2tw6NDRHaUP34=; b=PqFcpTvdUHGQIEhZG8gLKvecDQP7lP6KStDL4/1UGgio8e4Uyd52SK85sVc19JM+37f0AN xbLH7nC4sLNgNmzpKnuv9rTOjIrsJzkANOrdSPnMOwA70rZ/yNzIVKxF/TdjTMyQu45E/5 cCc9S9ODqqMkeg2Cd55nXRwVzsI9wrk= Received: from mail-ej1-f69.google.com (mail-ej1-f69.google.com [209.85.218.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-115-09SX36qnP0mCktVf8W-FPA-1; Wed, 13 Jan 2021 03:59:47 -0500 X-MC-Unique: 09SX36qnP0mCktVf8W-FPA-1 Received: by mail-ej1-f69.google.com with SMTP id j14so488281eja.15 for ; Wed, 13 Jan 2021 00:59:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=QuTRToQJZ9ENJOQ+foe03ejm+/o+GM2tw6NDRHaUP34=; b=HeeSATAFRy1jkI8NKx3J8GZekZbJ1GiYH7LDBcvv7AEekwzZvWPE7gULz3tS96p8hf rmR8jR6Z2RDEaUx6iD1Ne9Qmkt4stks+Rqk9SVTdy633nRZMlGFjZAH5OKqJ+BparOwF Nd7sQk+a4PdQ6EbAnABq1aaZiHULnTiHx1tvqfV6Mz2+L11EpVuSygkcTQmgQHNZoygt vsEy91vVKFi6AOYNnc6OWOFj1docZuLX134M+TQh9CRNOFgNtr9YGnb2FvfBM/dBICAk OhU6DW6EvEpxbe9MZCZeHBKrCzrvVXv7cjk2fYlJx+TD4wfVgsJuiSiZG9eKGL6PKczN 8DCQ== X-Gm-Message-State: AOAM5339m8VqawOyWBap9ZhSuySizUndRuaNsjIBHQi8xP/gOEx0sYKZ GvmKCT5nHbPNWMQy2xlhEalCajQCqWvf0VO9gTafrSSdXjKqbKyGdHkBwpd2mdtZ4X+ahF6Sz3x ft63yz5eXswoLb1Sd/GUwwrHGsETjA168Y5yRqvxfPT1R/6owLrd84yYmwlwWrdcGyJ8VLnE+AH 04 X-Received: by 2002:a17:906:adce:: with SMTP id lb14mr825182ejb.502.1610528385612; Wed, 13 Jan 2021 00:59:45 -0800 (PST) X-Google-Smtp-Source: ABdhPJyFa+J3n+6YPkg6zlbrlGTjqx+UvGVawy0I7OSetvR0OSlaqpYHVx5JIy3LcDri33K59tFgZQ== X-Received: by 2002:a17:906:adce:: with SMTP id lb14mr825165ejb.502.1610528385451; Wed, 13 Jan 2021 00:59:45 -0800 (PST) Received: from x1.localdomain (2001-1c00-0c1e-bf00-37a3-353b-be90-1238.cable.dynamic.v6.ziggo.nl. [2001:1c00:c1e:bf00:37a3:353b:be90:1238]) by smtp.gmail.com with ESMTPSA id ga11sm441697ejb.34.2021.01.13.00.59.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 Jan 2021 00:59:44 -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> From: Hans de Goede Message-ID: Date: Wed, 13 Jan 2021 09:59:44 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20210112223015.GB28214@duo.ucw.cz> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 1/12/21 11:30 PM, Pavel Machek wrote: > Hi! > >> Booting a 5.11-rc2 kernel with lockdep enabled inside a virtualbox vm (which still >> emulates good old piix ATA controllers) I get the below lockdep splat early on during boot: >> >> This seems to be led-class related but also seems to have a (P)ATA >> part to it. To the best of my knowledge this is a new problem in >> 5.11 . > > This is on my for-next branch: > > commit 9a5ad5c5b2d25508996f10ee6b428d5df91d9160 (HEAD -> for-next, origin/for-next) > > leds: trigger: fix potential deadlock with libata > > We have the following potential deadlock condition: > > ======================================================== > WARNING: possible irq lock inversion dependency detected > 5.10.0-rc2+ #25 Not tainted > -------------------------------------------------------- > swapper/3/0 just changed the state of lock: > ffff8880063bd618 (&host->lock){-...}-{2:2}, at: ata_bmdma_interrupt+0x27/0x200 > but this lock took another, HARDIRQ-READ-unsafe lock in the past: > (&trig->leddev_list_lock){.+.?}-{2:2} > > If I'm not mistaken, that should fix your issue. I can confirm that this fixes things, thanks. I assume that this will be part of some future 5.11 fixes pull-req? Regards, Hans