BUG: sleeping function called from invalid context at mm/slub.c:1719

Question

I have allocated a pointer like

int *ptr = kmalloc(sizeof(int), GFP_ATOMIC); 

And this pointer is deallocated in a timer function which having 5 second timeout value.

if( NULL != ptr )                
{                 
  kfree(ptr);
  ptr = NULL;
}

Please advise me what is wrong here.. Thanking in advance.

Answer 1

kfree() must not be used in an atomic context, such as a timer function.

Move it to another context, such as a workqueue.