title: What is "Trace/BPT trap: 5"?
body: <p>What does <em>Trace/BPT trap: 5</em> mean, when a Mac OS X application suddenly exits?</p>
  
  <p>Searching the web I only found out that a lot of applications exit like this (ruby, postgres) but only find application specific solution. But I want to understand what that is and how it is caused.</p>
  
  <p>I also found that it seems to be an issue on Mac OS X only (did not find any mentions of this happening with Linux or Windows). I believe it has something to do with threading, but I'm not sure about that one.</p>