title: Valgrind showing error calling pr_set_ptracer, vgdb might block
body: <p>I am using Valgrind to find memory leaks of my C program and although it looks like it is running fine and showing allocated and freed memory. But, I want to know why it is throwing this error and what are its consequences.</p>
  
  <p>Here the snippet of error:</p>
  
  <pre><code>==483== Memcheck, a memory error detector
  ==483== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
  ==483== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
  ==483== Command: ./main ../old\ projects
  ==483== 
  ==483== error calling PR_SET_PTRACER, vgdb might block
  </code></pre>