[SOLVED] Disagrees about version of symbol symbol_name after insmod

Issue

I am new in kernel programming.

For implementing my project work, I have downloaded the latest stable kernel (v4.3) from rel="nofollow noreferrer">kernel.org.

Just for checking I have copied a few files from the kernel directories into my project directory. Made changes to it and inserted a few more code to it.

Then I compiled on SLES11 Linux kernel using

make -C /lib/modules/$(uname -r)/build M=$PWD modules

I have used the below makefile

obj-m := my_module.o
my_module-objs := module_main.0 other_module1.o other_module2.o other_module3.o

It compiled successfully. But when I tried to insert into the kernel using

insmod my_sample.ko

It showed the following

disagrees about version of symbol symbol_name

Solution

The problem here is that your Kernel module is using the exported symbols of other kernel modules which in this case appears to be the linux InfiniBand RDMA stack's exported methods or symbols.

To solve the symbol version problems, copy the Module.symvers file from the

/usr/src/ofa-kernel

directory and paste it to your current working directory. Then you make your modules again. Now the insmod should work perfectly fine.

NOTE: The Module.symvers file contains information of all the kernel module exported symbol. So by copying it to your working directory, you are helping kbuild to know more about the used exported symbols.

And if you don't find Module.symvers or it is empty, then create one using create_Module.symvers.sh

Answered By - Utkal Sinha

Answer Checked By - Gilberto Lyons (WPSolving Admin)