Busybox modprobe brings error "Invalid ELF header magic: !=ELF"

[Service IIT (Mayer EMI)]

Am 18.03.2023 um 10:46 schrieb Norbert Lange:
> Hello,
>
> BusyBox first tries to pass the module the the kernel via 
> filedescriptor, this method only accepts uncompressed files. Yielding 
> that error message.
>
> Only then it will decompress the module and try again.
>
>
> Regards, Norbert.

Ok, understood.
However, why even does it not work with the filedescriptor
Kernel setting
      [*]   Support in-kernel module decompression
should enable this to work not needing the modprobe to fallback to 
uncompress and try it again - or not?

>
> https://bugs.busybox.net/show_bug.cgi?id=14041
>
> On Sat, 18 Mar 2023, 10:41 Service IIT (Mayer EMI), 
> <service.iit at mayer-emi.at> wrote:
>
>
>     Am 18.03.2023 um 02:57 schrieb Khem Raj:
>     > On Fri, Mar 17, 2023 at 2:10 PM Service IIT (Mayer EMI)
>     > <service.iit at mayer-emi.at> wrote:
>     >> Hi
>     >>
>     >> Can somone help how to get rid of the message "Invalid ELF
>     header magic:
>     >> !=ELF" of busybox when using moprobe with compressed kernel modules
>     >>
>     > Something is not in ELF format. Can you provide more details of what
>     > you are trying to do?
>
>     Having compiled the kernel (6.1.19) with
>            Module compression mode (XZ)  --->
>            [*]   Support in-kernel module decompression
>
>     Having compiled busybox with
>          Archival Utilities  --->
>             [*] Make tar, rpm, modprobe etc understand .xz data
>             [*] Make tar, rpm, modprobe etc understand .gz data
>
>     Modules are succesfully compressed compiled
>     Booting up brings
>
>     "Invalid ELF header magic: !=ELF" message for each loaded module,
>     modules are loaded and working (show up in lsmod and functionality
>     is given)
>
>     running modprobe manually have the same result
>
>     >> BusyBox v1.36.0 (2023-03-17 16:25:58 UTC) multi-call binary.
>
-- 
- M -
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