Comment 19 for bug 1533009

On Tue, Jan 19, 2016 at 3:31 PM, Dann Frazier
<email address hidden> wrote:
> On Tue, Jan 19, 2016 at 2:24 PM, Christophe Lyon
> <email address hidden> wrote:
>> It's not clear to me how I can reproduce the problem as a GCC developper.
>> Should I build kernel-4.3.0 (vanilla), using the defconfig attached on comment #13, build the modules and look for the relocation mentioned by Ard Biesheuvel?
>
> Hi Christophe,
> Here's the steps to reproduce (I'm doing this in an Ubuntu
> 16.04/arm64 QEMU/KVM VM):
>
> tar xfJ linux-4.3.3.tar.xz
> cd linux-4.3.3
> make defconfig
> # enable simple module for testing
> echo "CONFIG_OVERLAY_FS=m" >> .config
> make oldconfig
> make Image modules

Forgot one step:

sudo make modules_install

  -dann

> sudo make install
> sudo reboot
>
> Then, on reboot:
>
> $ sudo dmesg -c > /dev/null
> $ sudo modprobe overlay
> modprobe: ERROR: could not insert 'overlay': Exec format error
> $ dmesg
> [ 336.449238] module overlay: unsupported RELA relocation: 275
> ubuntu@ubuntu:~$