title: how to view segmentation fault (core dumped)
body: <p>I am unable to move forward in getting to see the core dumped.</p>
  
  <p>I have got this when i typed </p>
  
  <pre><code>gdb normal_estimation core
  
  
  Reading symbols from /home/sai/Documents/pcl_learning/normal_estimation/build/normal_estimation...(no debugging symbols found)...done.
  
  warning: core file may not match specified executable file.
  [New LWP 11816]
  
  warning: Can't read pathname for load map: Input/output error.
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
  Core was generated by `./normal_estimation'.
  Program terminated with signal 11, Segmentation fault.
  #0  0xb53101d6 in free () from /lib/i386-linux-gnu/libc.so.6
  (gdb) 
  </code></pre>
  
  <p>Please let me know what should i do?</p>