I have two kernel modules running.
Module 1:
- struct a
{
int val1;
char *buffer
...
};
- Then in module 1, I have following global declaration
struct a buf[20];
- Module 1, calls a exported function "module2_function(int *)" from modules 2:
it passes &buff[0].val1 as a parameter to the module2_functon
Module 2:
- I assign buff[0].val1 to variable defined as *i
- I print *i, and see same data which was assigned by module 1, i.e. 0x9595
- Have following instruction
- *i = 1;
- print *i again and new values i.e. 1 is printed
- after this in less than a second whole freezes
After debugging for whole day, I tried following, which seems to fix this issue
- I changed struct a buf[20]; to kmalloc
- now system does not freez
Can anyone explain why is this. In first case, why is system freezing ?
Thanks
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