linux-kernel - Re: vmlinux.o: warning: objtool: elf

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Message-ID: <8e5d1a33-ff5f-41ec-86a7-b93d44aed287@alliedtelesis.co.nz>
Date: Sun, 2 Nov 2025 22:01:44 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>, "jpoimboe@...nel.org"
	<jpoimboe@...nel.org>, "peterz@...radead.org" <peterz@...radead.org>
CC: "OCP-ONIE@...-All.groups.io" <OCP-ONIE@...-All.groups.io>
Subject: Re: vmlinux.o: warning: objtool: elf_update: invalid section
 alignment


On 03/11/2025 09:05, Chris Packham wrote:
> Hi,
>
> I'm investigating bringing ONIE[1] up to date with respect to kernel 
> and toolchain versions.
>
> I've updated the toolchain and things seem happy with linux-5.4.86. 
> But when I try linux-6.12.55 I hit the following error from objtool
>
> vmlinux.o: warning: objtool: elf_update: invalid section alignment
> make[3]: *** [scripts/Makefile.vmlinux_o:65: vmlinux.o] Error 255
> make[3]: *** Deleting file 'vmlinux.o'
> make[2]: *** 
> [/home/chrisp/src/onie/build/alliedtelesis_x980_32cq-r0/kernel/linux-6.12.55/Makefile:1161: 
> vmlinux_o] Error 2
> make[1]: *** [Makefile:224: __sub-make] Error 2
> make[1]: Leaving directory 
> '/home/chrisp/src/onie/build/alliedtelesis_x980_32cq-r0/kernel/linux-6.12.55'
> make: *** [make/kernel.make:120: 
> /home/chrisp/src/onie/build/alliedtelesis_x980_32cq-r0/stamp/kernel-build] 
> Error 2
>
> I also tried 6.6.115 and get the same error
>
> Does this ring any bells?
>
> I'm building inside a docker container based on debian 11.
>
> PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
> NAME="Debian GNU/Linux"
> VERSION_ID="11"
> VERSION="11 (bullseye)"
> VERSION_CODENAME=bullseye
> ID=debian
> HOME_URL="https://www.debian.org/"
> SUPPORT_URL="https://www.debian.org/support"
> BUG_REPORT_URL="https://bugs.debian.org/"
>
> I'm able to reproduce the issue building the kernel using the ONIE 
> built cross-compiler (using crosstool-ng under the hood) but not with 
> the native one. However I don't see an issue in another crosstool-ng 
> environment building the same tools (based on debian 12 so it might 
> not be a fair comparison).

Bit of an update. I created a fresh debian 11 based container and am 
able to reproduce the problem with the onie toolchain config, the 
default crosstool-ng x86_64-unknown-linux-uclibc sample and the default 
crosstool-ng x86_64-unknown-linux-gnu sample.