Error: removing '***': device or resource busy

 

Compile the first example helloworld in the experiment Linux driver, but the insmod installation is successful.

 

Dmsg | grep ** can also find the printed information of my module installation, but an error occurs during rmmod.

Error: removing 'helloworld': device or resource busy

Rmmod -- Force Delete is useless

 

The following are some common causes:

1. module_exit is not compiled as required;

2. Check that many low-level function names on stackflow are incorrect.

 

Finally, the following is a reference:

Http://forum.ubuntu.com.cn/viewtopic.php? F = 97 & t = 364431

 

The current GCC version of the current system does not match the GCC version of the kernel.

Since the previous = compilation of other code will change the GCC connection to version 4.4, but my ubuntu12.04 kernel GCC is 4.6

 

Ls-Al/usr/bin/GCC view GCC version

CAT/proc/version: displays the system information, including the GCC version of the kernel.