linux-kernel - vmlinux.o: warning: objtool: elf_update: invalid section alignment

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Message-ID: <9024a693-d300-4428-ae11-b5a852113e25@alliedtelesis.co.nz>
Date: Sun, 2 Nov 2025 20:05:35 +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: vmlinux.o: warning: objtool: elf_update: invalid section alignment

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).

Thanks,
Chris

--

[1] - https://github.com/opencomputeproject/onie/