From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 126FB22B8C5 for ; Sat, 28 Feb 2026 05:48:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772257734; cv=none; b=giqLXjJuJdruYV1kk7LGm8IZszHLAn0Go0CKcfFl2NRu8LHF6DwaLxQTnRX5Oeqcv0yiZLiY8geru2S0k9NuYjt2S9UBIcsnMAxaZMd4g/Jqwd6KgQvHlQ4ZBfNFq+weXO9G95P8QDNZh7+a79u76CmtwxdVLk/N+hEt3AMuskU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772257734; c=relaxed/simple; bh=YQAdqqBUqJsZSxm0fNFIK3JU64R4cprvHv7/i1rGlPQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TumCBURr+nFvjlbgAd/Qcrj89kFZ9fdz2tgXGP0KmTzWSN4AdFNvyQnDMBUdXsp4WzIveK6r8QSxR0BEtHx5NPt/KhkVBJI2SFqzGccaAFADLOOaA+n3XEHgbgweEg6sARl5SqvNH/RGn04PbBI2Cbb6niWJLX/ZGqmME9KbyYY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qbD47ktT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qbD47ktT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E920DC116D0; Sat, 28 Feb 2026 05:48:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772257733; bh=YQAdqqBUqJsZSxm0fNFIK3JU64R4cprvHv7/i1rGlPQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qbD47ktTntv8tV/L+yB0a9D+VjHvefKkT3EfxDeUYTclExlL6DRRC0FHN25mTUtnb r6yvYAkJCyA6hmVB6b1IvBikB/G6QsoOMBPBI7AEC8u0Bcs8flyl3HhgWD+XpfmgZf B6eH5JJOyBDt/NvzT06AFS9X3nYRgJQWOa8L6qFdVxfj0KVFjPM9oPmfgBQaafwpEO wg2ruWpFXd2Fmb2l5ZZTqvqbYTX5T9M0nEiWBQWGGv2SWBFHBWJ0Kuv91EJjusTiY+ Xc08Xc39cZe+qx4ttRD6Kt01ywyky0YcBh4HgT8RC+Hpl7Z8oS+1CeywHtTHgorNoY 4D3oTaRf+jITQ== Date: Fri, 27 Feb 2026 22:48:50 -0700 From: Nathan Chancellor To: Greg KH Cc: Rainer Fiebig , "stable@vger.kernel.org" , jpoimboe@kernel.org Subject: Re: 6.18.14: VirtualBox modules don't build anymore; bisected Message-ID: <20260228054850.GA2321895@ax162> References: <62d12399-76e5-3d40-126a-7490b4795b17@mailbox.org> <2026022741-mahogany-coveted-acfa@gregkh> <2026022738-tricky-popper-c70e@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2026022738-tricky-popper-c70e@gregkh> On Fri, Feb 27, 2026 at 08:29:05PM -0500, Greg KH wrote: > On Sat, Feb 28, 2026 at 12:30:29AM +0100, Rainer Fiebig wrote: > > Am 27.02.26 um 21:12 schrieb Greg KH: > > > On Fri, Feb 27, 2026 at 04:33:34PM +0100, Rainer Fiebig wrote: > > >> In case this hasn't been reported already: with 6.18.14 the > > >> VirtualBox-7.1.16 modules won't build during the boot process, as they > > >> usually do. Bisecting between 6.18.13/14 led to this: > > >> > > >> f056c340b73962ebaffe93997b582bdf16dc6270 is the first bad commit > > >> commit f056c340b73962ebaffe93997b582bdf16dc6270 (HEAD) > > >> Author: Josh Poimboeuf > > >> Date: Tue Feb 10 13:45:22 2026 -0800 > > >> > > >> kbuild: Add objtool to top-level clean target > > >> > > >> [ Upstream commit 68b4fe32d73789dea23e356f468de67c8367ef8f ] > > >> > > >> Objtool is an integral part of the build, make sure it gets cleaned > > >> by "make clean" and "make mrproper". > > >> [...] > > >> > > >> > > >> The script I use for building my kernels includes "make mrproper" before > > >> compiling and "make clean" after the kernel and modules have been > > >> installed. > > >> > > >> Perhaps it would be more appropriate to report this to the > > >> VirtualBox-devs but I won't do that because the registration procedure > > >> asks for too many private data. > > > > > > We obviously can not do anything about external modules, so if you rely > > > on these, you are going to have to work with them on this, sorry. > > > > Alright, tough luck. But that a patch-release of an LTS-kernel breaks > > VirtualBox is really a first - at least as far as I can remember. > > Then they have gotten really lucky :) I think this is firmly a Kbuild bug, as we broke the contract of 'make clean' leaving around enough to build external modules: https://lore.kernel.org/20260227-avoid-objtool-binary-removal-clean-v1-1-122f3e55eae9@kernel.org/ Kbuild is what runs objtool, not the external module itself. I don't care much for external modules but this does not appear to be something they have done or relied on. Cheers, Nathan