[SOLVED] Kernel module on cross-compile kernel: /bin/sh: 1: scripts/basic/fixdep: Exec format error

Issue

I'm doing some experiment on rpi4, and trying to reproduce this kernel module from github https://github.com/sysprog21/dont-trace on my rpi4. I encounter this problem:

make -C /lib/modules/`uname -r`/build M=/home/ubuntu/dont-trace modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.65-rt49-preemptrt-full-raspi'
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: aarch64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110
  You are using:           gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
  CC [M]  /home/ubuntu/dont-trace/dont_trace.o
/bin/sh: 1: scripts/basic/fixdep: Exec format error
make[2]: *** [scripts/Makefile.build:289: /home/ubuntu/dont-trace/dont_trace.o] Error 126
make[2]: *** Deleting file '/home/ubuntu/dont-trace/dont_trace.o'
make[1]: *** [Makefile:1896: /home/ubuntu/dont-trace] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.65-rt49-preemptrt-full-raspi'
make: *** [Makefile:7: all] Error 2

The kernel here is cross-compiled from x86 server and do show above. I was wondering how to solve this problem & what's the root cause. I can make it on x86 server. It should be something fundamental knowledge I don't understand. Thks!

Solution

it seems work this time

My solution might be a bit workaround, but it works. I follow the clues /bin/sh: 1: scripts/basic/fixdep: Exec format error. So I copy the source code to local raspberry pi, and make modules_prepare to construct complete /scripts, then move it into /lib/modules/`uname -r\`/build. It remain the gcc version warning, but work properly.

Answered By - yenWu

Answer Checked By - Cary Denson (WPSolving Admin)