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 D6CCCC05027 for ; Thu, 26 Jan 2023 12:11:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236754AbjAZMLb (ORCPT ); Thu, 26 Jan 2023 07:11:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236627AbjAZMLa (ORCPT ); Thu, 26 Jan 2023 07:11:30 -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 98EA8410BB; Thu, 26 Jan 2023 04:11:28 -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 4FC75B81D89; Thu, 26 Jan 2023 12:11:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C397CC433D2; Thu, 26 Jan 2023 12:11:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674735086; bh=KPkKSD7aWhYpforFO0pJPJv3XA4UUvnD2v1EFugEgqY=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=DsfeXP3MPywBfapf1j68U2fsYoRWJr1DaPzWi74NDujNgTDyNgQ1iInlpLvOBPWhZ dgbjF41INaKWSTmLGbC6hUi2hlVxaE3zeJX6nAjNxaHhzv2MWnLknFBp41TOIT81B2 ln/BLPiIuK03YBpKim2U/tMG4LCKbrlthnwZlrX9s7FWpYyliW/zSN25yS4zXbq6o1 oDeL383myENTyDldeQc8KuV4Re3HOXcuwLoBBFx/2jrf/CCCq6GjCcNSUwdCT4iLtw qDQ0oKQdF6wfufBEEOLwk+7/zpHzn/jpN3EV9/3fihC2XnpD7F9xiZbGBioLd3EI44 Yv4H+MnVBlyxQ== Date: Thu, 26 Jan 2023 06:11:24 -0600 From: Bjorn Helgaas To: Thomas Zimmermann Cc: Takashi Iwai , linux-pci@vger.kernel.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, "Zeno R.R. Davatz" , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Javier Martinez Canillas , Antonino Daplas , Helge Deller , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, regressions@lists.linux.dev Subject: Re: [REGRESSION] [Bug 216859] New: PCI bridge to bus boot hang at enumeration Message-ID: <20230126121124.GA1258686@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230112200819.GA1785077@bhelgaas> Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org [+cc folks from 145eed48de27 and framebuffer folks, regression list] 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 . Bjorn