Re: [gentoo-user] Re: Latest 4.9 kernels broken?

[Alexander Kapshuk]

On Sat, Jun 9, 2018 at 5:26 PM Ian Zimmerman <itz@××××××××××××.org> wrote:
>
> On 2018-06-09 14:15, Alexander Kapshuk wrote:
>
> > I had a look at the source code for kmod-25. If I read it right, dmesg
> > should have records along the lines of:
> > kmod-25/libkmod/libkmod-module.c:886:           INFO(mod->ctx, "Failed
> > to insert module '%s': %m\n", path);
> >
> > modprobe returns Exec format error.
>
> > Now, if my understanding of the source code above is right, you either
> > have CONFIG_X86_32 set in your kernel, e.i. your Elf_Ehdr is set to
> > Elf32_Ehdr, or the module's header is for the architecture that is
> > different from what is expected by the kernel.
>
> The former is definitely false.  If the latter holds, it is not due to
> any action on my part, but due to how the module is built by the kernel
> build system (at the same time as the kernel proper).  Again, I strongly
> suspect this is due to all the "objtool" churn in 4.9.106 and later.
>
> I'm afraid I'm at the limit of my patience diving into this for now.
> You see, I have to remove the broken kernel from grub manually every
> time (and then re-add it for another test), otherwise it breaks
> unattended boots.
>
> Sorry about that.  Maybe in a few days I'll have time to sit down and
> track it properly.
>
> --
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>

I appreciate that this has been a frustrating experience for you, but
when you get a change, could you please run 'readelf -h' on the module
concerned and show the output below:
readelf -h /path/to/module.ko
ELF Header:
Magic:
Class:
Machine:
Size of this header:

This will either confirm or refute my assumption about the ELF header
being the wrong size and causing the 'Exec format error' message to be
printed.

Thanks.