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 DCF2E26388D; Tue, 4 Mar 2025 16:20:26 +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=1741105227; cv=none; b=FwFbk7p95w7EABG3jWuxdSc+c8ULWPEshVHVWE92o/U0Bd9x4qA3caPyj7/3peRcaAne3t/Zt5ruQF8U4nUt5BPe50hfQKV32B4gPMuZNf2oxUKP2g7fV/78c4/I1y9Sny/uDoyJb/yBZgKpLDUVdoT3B93tmAhyvWpja6GzACs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741105227; c=relaxed/simple; bh=TkxPbcmHtN7pCbda8Jun30wnH1K0iXw0SY5Ec2Wx1ys=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=q0m7D7UIrEQh8sZ7PIS933LhUm7643T179Vf8S661GDblSkL3rcnlveE+dqNLq0CGej3Xk4e8m1L2Wt515ZxFFRZ622+8SNMmZH0iDp/klwbfBcvfu1hdtYI1e/khwbuHjU/Rvg5erkCcr+WVnc76Kpn/rXI4qJVNBOn+4uMTBA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qhgzmTBD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qhgzmTBD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E74EAC4CEE5; Tue, 4 Mar 2025 16:20:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1741105226; bh=TkxPbcmHtN7pCbda8Jun30wnH1K0iXw0SY5Ec2Wx1ys=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qhgzmTBD3hKPMAUmIo86nmjLCsULTyxwhrQzkOfhoi8i+3wyI8CA93NOMxdgMglbx WAqwK8VgGk4Sf9B8kMYwLJjHBRsr9/cQMb5UZRvPfkUV2TDO027F4yIp3FrBy4YG8k YzxViWc6NmNuGPsgFKhiO9TwvTgVavRk74QCI4Zw= Date: Tue, 4 Mar 2025 17:20:22 +0100 From: Greg KH To: Ulrich Gemkow Cc: stable@vger.kernel.org, regressions@lists.linux.dev, ardb@kernel.org Subject: Re: Regression for PXE boot from patch "Remove the 'bugger off' message" in stable 6.6.18 Message-ID: <2025030459-singer-compactor-9c91@gregkh> References: <202503041549.35913.ulrich.gemkow@ikr.uni-stuttgart.de> 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: <202503041549.35913.ulrich.gemkow@ikr.uni-stuttgart.de> On Tue, Mar 04, 2025 at 03:49:35PM +0100, Ulrich Gemkow wrote: > Hello, > > starting with stable kernel 6.6.18 we have problems with PXE booting. > A bisect shows that the following patch is guilty: > > From 768171d7ebbce005210e1cf8456f043304805c15 Mon Sep 17 00:00:00 2001 > From: Ard Biesheuvel > Date: Tue, 12 Sep 2023 09:00:55 +0000 > Subject: x86/boot: Remove the 'bugger off' message > > Signed-off-by: Ard Biesheuvel > Signed-off-by: Ingo Molnar > Acked-by: H. Peter Anvin (Intel) > Link: https://lore.kernel.org/r/20230912090051.4014114-21-ardb@google.com > > With this patch applied PXE starts, requests the kernel and the initrd. > Without showing anything on the console, the boot process stops. > It seems, that the kernel crashes very early. > > With stable kernel 6.6.17 PXE boot works without problems. > > Reverting this single patch (which is part of a larger set of > patches) solved the problem for us, PXE boot is working again. > > We use the packages syslinux-efi and syslinux-common from Debian 12. > The used boot files are /efi64/syslinux.efi and /ldlinux.e64. > > Our config-File (for 6.6.80) is attached. > > Regarding the patch description, we really do not boot with a floppy :-) > > Any help would be greatly appreciated, I have a bit of a bad feeling > about simply reverting a patch at such a deep level in the kernel. Does newer kernels than 6.7.y work properly? What about the latest 6.12.y release? thanks, greg k-h