** Description changed:
On Ubuntu 26.04 with linux-image-7.0.0-29-generic, no out-of-tree kernel
module will load. Modules build cleanly and sign correctly, but insmod
fails with "Invalid module format" and the kernel logs an invalid
relocation target.
Reproducer — a six-line module with no dependencies is enough:
- mkdir -p ~/hellomod && cd ~/hellomod
- printf '#include <linux/module.h>\nstatic int __init h(void){return
0;}\nstatic void __exit
b(void){}\nmodule_init(h);\nmodule_exit(b);\nMODULE_LICENSE("GPL");\n' > hello.c
- printf 'obj-m += hello.o\n' > Makefile
- make -C /lib/modules/$(uname -r)/build M=$PWD modules
- sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 \
- /var/lib/shim-signed/mok/MOK.priv /var/lib/shim-signed/mok/MOK.der
hello.ko
- sudo insmod hello.ko
+ mkdir -p ~/hellomod && cd ~/hellomod
+ printf '#include <linux/module.h>\nstatic int __init h(void){return
0;}\nstatic void __exit
b(void){}\nmodule_init(h);\nmodule_exit(b);\nMODULE_LICENSE("GPL");\n' > hello.c
+ printf 'obj-m += hello.o\n' > Makefile
+ make -C /lib/modules/$(uname -r)/build M=$PWD modules
+ sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 \
+ /var/lib/shim-signed/mok/MOK.priv /var/lib/shim-signed/mok/MOK.der
hello.ko
+ sudo insmod hello.ko
Expected: module loads.
Actual: insmod: ERROR: could not insert module hello.ko: Invalid module
format
dmesg:
- module: x86/modules: Invalid relocation target, existing value is
- nonzero for sec 41, idx 1, type 1, loc ffffffffc31564d0, val
- ffffffffc34c0010
+ module: x86/modules: Invalid relocation target, existing value is
+ nonzero for sec 41, idx 1, type 1, loc ffffffffc31564d0, val
+ ffffffffc34c0010
readelf identifies the failing section as .gnu.linkonce.this_module. Its
relocation section contains only the two standard entries every kernel
module has:
- Offset Type Symbol
- 0x138 R_X86_64_64 init_module + 0
- 0x490 R_X86_64_64 cleanup_module + 0
+ Offset Type Symbol
+ 0x138 R_X86_64_64 init_module + 0
+ 0x490 R_X86_64_64 cleanup_module + 0
Environment:
- Ubuntu 26.04 LTS
- Linux 7.0.0-29-generic #29-Ubuntu SMP PREEMPT_DYNAMIC Fri Jul 17 2026
- Kernel built with gcc 15.2.0 (Ubuntu 15.2.0-16ubuntu1), GNU ld 2.46
- Modules built with the same gcc 15.2.0 — vermagic matches
- linux-image, linux-headers and linux-modules are all 7.0.0-29.29, so
- there is no version skew between the running kernel and the build
- headers
- Secure Boot enabled, MOK enrolled, signing verified working (an
- unsigned module fails differently, with "Key was rejected by service")
- CONFIG_MODULE_COMPRESS_ZSTD=y
- CONFIG_MITIGATION_ITS=y, but the CPU reports "Not affected" and booting
- with indirect_target_selection=off makes no difference
- nvidia on this system is the prebuilt linux-modules-nvidia-595-open
- package, built alongside the kernel rather than via DKMS, so it is
- not a working out-of-tree counter-example. There are no other DKMS
- modules installed to compare against.
+ Ubuntu 26.04 LTS
+ Linux 7.0.0-29-generic #29-Ubuntu SMP PREEMPT_DYNAMIC Fri Jul 17 2026
+ Kernel built with gcc 15.2.0 (Ubuntu 15.2.0-16ubuntu1), GNU ld 2.46
+ Modules built with the same gcc 15.2.0 — vermagic matches
+ linux-image, linux-headers and linux-modules are all 7.0.0-29.29, so
+ there is no version skew between the running kernel and the build
+ headers
+ Secure Boot enabled, MOK enrolled, signing verified working (an
+ unsigned module fails differently, with "Key was rejected by service")
+ CONFIG_MODULE_COMPRESS_ZSTD=y
+ CONFIG_MITIGATION_ITS=y, but the CPU reports "Not affected" and booting
+ with indirect_target_selection=off makes no difference
+ nvidia on this system is the prebuilt linux-modules-nvidia-595-open
+ package, built alongside the kernel rather than via DKMS, so it is
+ not a working out-of-tree counter-example. There are no other DKMS
+ modules installed to compare against.
Originally found while trying to load tuxedo-drivers for keyboard
backlight control. Reproduced with tuxedo-drivers 4.22.3, tuxedo-drivers
4.21.0 and tuxedo-keyboard 3.2.10 — three releases across two unrelated
codebases, all failing identically — which is what led to the minimal
reproducer above.
Caveat: very small modules do appear to load (tuxedo_compatibility_check,
~12KB, loads fine), so there may be a discriminator I have not
identified, and the failure may not be as universal as the reproducer
suggests. No earlier kernel is installed on this system, so I have not
been able to test whether this is specific to the 7.0.0-29 ABI.
+
+ Regression in 7.0.0-29-generic: out-of-tree modules fail to load with
+ "Invalid relocation target" on .gnu.linkonce.this_module (works on
+ 7.0.0-27)
+
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC1: matt 5277 F.... wireplumber
- /dev/snd/controlC0: matt 5277 F.... wireplumber
- /dev/snd/seq: matt 5271 F.... pipewire
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC1: matt 5277 F.... wireplumber
+ /dev/snd/controlC0: matt 5277 F.... wireplumber
+ /dev/snd/seq: matt 5271 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 15 21:42:44 2026
InstallationDate: Installed on 2026-08-15 (0 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
(20260423.1)
IwDevWlp5s0f0Link: Not connected.
Lsusb:
- Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
- Bus 001 Device 002: ID 1e7d:2c2e ROCCAT Lua Mouse
- Bus 001 Device 003: ID 5986:2170 Bison Electronics Inc. BisonCam,NB Pro
- Bus 001 Device 004: ID 8087:0036 Intel Corp. BE200 Bluetooth
- Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+ Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+ Bus 001 Device 002: ID 1e7d:2c2e ROCCAT Lua Mouse
+ Bus 001 Device 003: ID 5986:2170 Bison Electronics Inc. BisonCam,NB Pro
+ Bus 001 Device 004: ID 8087:0036 Intel Corp. BE200 Bluetooth
+ Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: 3XS Gamer
ProcEnviron:
- LANG=en_US.UTF-8
- PATH=(custom, no user)
- SHELL=/bin/bash
- TERM=xterm-256color
- XDG_RUNTIME_DIR=<set>
+ LANG=en_US.UTF-8
+ PATH=(custom, no user)
+ SHELL=/bin/bash
+ TERM=xterm-256color
+ XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-29-generic
root=UUID=7cabd3ec-7315-40bf-9c08-7a571a4ec64a ro quiet splash
indirect_target_selection=off
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/05/2025
dmi.bios.release: 7.8
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.08
dmi.board.asset.tag: Tag 12345
dmi.board.name: V3xxSNR
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.ec.firmware.release: 9.5
dmi.modalias:
dmi:bvnINSYDECorp.:bvr1.07.08:bd12/05/2025:br7.8:efr9.5:svn3XS:pnGamer:pvrNotApplicable:rvnNotebook:rnV3xxSNR:rvrNotApplicable:cvnNoEnclosure:ct10:cvrN/A:sku562254:pfaScanComputers:
dmi.product.family: Scan Computers
dmi.product.name: Gamer
dmi.product.sku: 562254
dmi.product.version: Not Applicable
dmi.sys.vendor: 3XS
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https://bugs.launchpad.net/bugs/2163585
Title:
No out-of-tree kernel module can load on 7.0.0-29-generic: "Invalid
relocation target" on R_X86_64_64 against .gnu.linkonce.this_module
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