weird "File descriptor leaked' messages

[ph1l]

weird "File descriptor leaked' messages:

# ./server-backup-s3 -l vg0/home -e -r CE4A0BF21E1C237DD8C400FAA39487B22697143F -B backup.bucket -R us-west-1 -P 10
File descriptor 10 (/dev/urandom) leaked on lvs invocation. Parent PID 8925: /usr/bin/python
File descriptor 10 (/dev/urandom) leaked on lvcreate invocation. Parent PID 8925: /usr/bin/python
  Rounding up size to full physical extent 2.33 GiB
  Logical volume "home.snapshot.2016-09-13-11-17-03" created
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