- go to ~/insync/media/photos/ and run rsdedup a couple of times. In some of them it crashes with the following error:
  $ rsdedup dedup delete
  thread '<unknown>' (2371368) has overflowed its stack
  fatal runtime error: stack overflow, aborting
  Aborted (core dumped)

- entries in the cache must be full path and not relative path since rsdedup can be run from
  different folders.

