FATAL Module not found error using modprobe

Question

I have a problem with modprobe command    I compiled the hello world module and loaded it with insmod  it works fine and when I do lsmod  I can see it in the output list  But when I insert this module using modprobe I am getting a FATAL error   root okapi  home ravi  modprobe   hello ko  FATAL  Module   hello ko not found  root okapi  home ravi    Here is the module code    include  lt linux init h gt   include  lt linux module h gt   MODULE LICENSE  Dual BSD GPL     static int hello init void            printk KERN ALERT  Hello  world n            return 0    static void hello exit void            printk KERN ALERT  Goodbye  cruel world n       module init hello init   module exit hello exit     and Makefile  obj-m    hello o  all          make -C  lib modules   shell uname -r  build M   PWD  modules  clean          make -C  lib modules   shell uname -r  build M   PWD  clean

User · Accepted Answer

The reason is that modprobe looks into  lib modules   uname -r  for the modules and therefore won t work with local file path  That s one of differences between modprobe and insmod

User · Answer

The best thing is to actually use the kernel makefile to install the module   Here is are snippets to add to your Makefile  around the top add   PWD   shell pwd  VER   shell uname -r  KERNEL BUILD  lib modules   VER  build   Later if you want to package the module binary you can provide an INSTALL ROOT   INSTALL ROOT  tmp install-root   around the end add   install            MAKE  -C   KERNEL BUILD  M   PWD               INSTALL MOD PATH   INSTALL ROOT  modules install   and then you can issue       sudo make install   this will put it either in  lib modules   uname -r  extra    or  lib modules   uname -r  misc   and run depmod appropriately

User · Answer

Ensure that your network is brought down before loading module   sudo stop networking   It helped me - https   help ubuntu com community UbuntuBonding

User · Answer

Try insmod instead of modprobe  Modprobe looks in the module directory  lib modules uname -r for all the modules and other files

User · Answer

i think there should be entry of your your module ko in  lib modules uname -r modules dep and in  lib modules uname -r modules dep bin for  modprobe your module  command to work

User · Answer

Insert this in your Makefile     MAKE  -C   KDIR  M   PWD  modules install                         it will install the module in the directory  lib modules  lt var gt  extra   After make   insert module with modprobe module name  without  ko extension    OR  After your normal make  you copy module module name ko into   directory   lib modules  lt var gt  extra    then do modprobe module name  without  ko extension

[c] "FATAL: Module not found error" using modprobe

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