title: How to get line number by function offset address from dumps
body: <p>I was using kasan first time and got error of following type</p>
  
  <pre><code>==================================================================
  BUG: AddressSanitizer: out of bounds access in kmalloc_oob_right+0x65/0x75 [test_kasan] at addr ffff8800693bc5d3
  Write of size 1 by task modprobe/1689
  =============================================================================
  BUG kmalloc-128 (Not tainted): kasan error
  -----------------------------------------------------------------------------
  
  Disabling lock debugging due to kernel taint
  INFO: Allocated in kmalloc_oob_right+0x3d/0x75 [test_kasan] age=0 cpu=0 pid=1689
   __slab_alloc+0x4b4/0x4f0
   kmem_cache_alloc_trace+0x10b/0x190
   kmalloc_oob_right+0x3d/0x75 [test_kasan]
   init_module+0x9/0x47 [test_kasan]
   do_one_initcall+0x99/0x200
   load_module+0x2cb3/0x3b20
   SyS_finit_module+0x76/0x80
   system_call_fastpath+0x12/0x17
  INFO: Slab 0xffffea0001a4ef00 objects=17 used=7 fp=0xffff8800693bd728 flags=0x100000000004080
  INFO: Object 0xffff8800693bc558 @offset=1368 fp=0xffff8800693bc720
  </code></pre>
  
  <p>how to get line number of buggy code from kmalloc_oob_right+0x65/0x75</p>