If your system is not configured to get core dumps, you are looking at the correct article (which may help you !!)

• To enable core dumps for all daemon, please follow these steps:
  Edit the /etc/profile and add this line:
  ulimit -c unlimited >/dev/null 2>&1
• Make sure the following line is present under /etc/init.d/functions
  ulimit -S -c ${DAEMON_COREFILE_LIMIT:-0} >/dev/null 2>&1
• File /etc/sysconfig/init (or) /etc/sysconfig/$daemon should have following line:
  DAEMON_COREFILE_LIMIT='unlimited'
• Optionally, enable core dump for SUID programs:
  echo 1 > /proc/sys/fs/suid_dumpable
• Edit the /etc/sysctl.conf and add the following:
  fs.suid_dumpable = 1
  kernel.core_uses_pid = 1
• Where to dump the file.
  sysctl -w kernel.core_pattern=core
  sysctl -w kernel.core_pattern=/tmp/core.%u.%e.%p
  - core dump file location should be writable.

Finally, perform sysctl -p to reload the settings.

Now consider your ftest program fails with segfaults ./launch.py <avocado tag : eg: iorsmall>,.

After you perform the above setup and run ftest program, you should see a core dump file under /tmp/core* location.