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 0C295C6379F for ; Wed, 1 Feb 2023 22:30:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231643AbjBAWaj (ORCPT ); Wed, 1 Feb 2023 17:30:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51094 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229609AbjBAWah (ORCPT ); Wed, 1 Feb 2023 17:30:37 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D3BB2FCFF; Wed, 1 Feb 2023 14:30:36 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 390ECB82234; Wed, 1 Feb 2023 22:30:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AE91C433D2; Wed, 1 Feb 2023 22:30:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675290633; bh=zot7qOvxCoMuk3Wa7msvKuV8ZKjBUkCftR+hKbpMvKg=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=G6BGYj8GNN1wSIw5qe4+JxQaJlNBaLF4nV7u7LDHOCEUorpic/7/hdux1jfRK8GLi A06Jui8y/0k9u7PZfSQ/4XKzZHLAtiOB1JqkI779XfcWpCG16HNN0DcPQuNrfxlFmr WNl3b4rzTYeL+opzUO7mcOv4QNbOPwHELFYPCLXUhAMrqrE5HS6jfe2XihaXjeJFiN USV4kfR1Pj3w6nETSKBrEIqrKuHhaDYnVD0zdZ4f/T8nOW5TJxh3M5iXjVRjFapoYR LrnpN1j+KST+snypzKs/4c7W2iD/v8aP4baRDDE6/pOtKwNLta62Bc1WdWrd8NMcpd TgBKkJmvxp3zA== Date: Wed, 1 Feb 2023 16:30:32 -0600 From: Bjorn Helgaas To: Thomas Zimmermann Cc: Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , alsa-devel@alsa-project.org, regressions@lists.linux.dev, Antonino Daplas , Takashi Iwai , linux-pci@vger.kernel.org, Helge Deller , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Javier Martinez Canillas , linux-fbdev@vger.kernel.org, "Zeno R.R. Davatz" , Geert Uytterhoeven Subject: Re: [REGRESSION] [Bug 216859] New: PCI bridge to bus boot hang at enumeration Message-ID: <20230201223032.GA1904036@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230126121124.GA1258686@bhelgaas> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [+cc Geert] On Thu, Jan 26, 2023 at 06:11:24AM -0600, Bjorn Helgaas wrote: > On Thu, Jan 12, 2023 at 02:08:19PM -0600, Bjorn Helgaas wrote: > > On Wed, Dec 28, 2022 at 06:02:48AM -0600, Bjorn Helgaas wrote: > > > On Wed, Dec 28, 2022 at 08:37:52AM +0000, bugzilla-daemon@kernel.org wrote: > > > > https://bugzilla.kernel.org/show_bug.cgi?id=216859 > > > > > > > Summary: PCI bridge to bus boot hang at enumeration > > > > Kernel Version: 6.1-rc1 > > > > ... > > > > > > > With Kernel 6.1-rc1 the enumeration process stopped working for me, > > > > see attachments. > > > > > > > > The enumeration works fine with Kernel 6.0 and below. > > > > > > > > Same problem still exists with v6.1. and v6.2.-rc1 > > This is a regression between v6.0 and v6.1-rc1. Console output during > boot freezes after nvidiafb deactivates the VGA console. > > It was a lot of work for Zeno, but we finally isolated this console > hang to 145eed48de27 ("fbdev: Remove conflicting devices on PCI bus"). > > The system actually does continue to boot and is accessible via ssh, > but the console appears hung, at least for output. More details in > the bugzilla starting at > https://bugzilla.kernel.org/show_bug.cgi?id=216859#c47 . 145eed48de27 ("fbdev: Remove conflicting devices on PCI bus") doesn't say what the benefit is, or what would break if we reverted it. Does anybody have any clues? It would be nice to resolve this regression before v6.2, which will probably be released 2/12 or 2/19. Bjorn